PH-D-06: The Senate Impeachment Trial of Vice-President Sara Duterte (2025–2026)

1. Key Takeaways

• The impeachment of Vice-President Sara Z. Duterte-Carpio — initiated on 5 February 2025 with the House plenary's transmittal of the Articles of Impeachment to the Senate, voided by the Supreme Court on 25 July 2025 as barred by the one-year rule, and re-initiated through new complaints in February 2026 that produced a second House impeachment vote on 11 May 2026 — is the most consequential constitutional accountability proceeding in the Philippines since the 2012 impeachment and conviction of Chief Justice Renato C. Corona (covered in PH-D-01). It is the first time a sitting Vice-President of the Republic has faced impeachment proceedings before the Senate sitting as an impeachment court — Vice-President Joseph Ejercito Estrada was impeached in October 2000 but the proceedings against him concerned his presidency (he had become President in June 1998) and were overtaken by the January 2001 EDSA-2 removal (covered in PH-C-03). The proceedings unfold within the post-EDSA 1987 Constitutional settlement (Article XI on Accountability of Public Officers; Article VII on the Vice-Presidency) and under the Senate's Rules of Procedure on Impeachment Trials. As of this document's last update (22 May 2026), the Senate has convened as an impeachment court on the second articles (18 May 2026), with the trial scheduled to open on 6 July 2026; the corpus does not predict the verdict but documents the procedural, evidentiary, and political architecture within which the verdict will be reached.

• The trial's structural significance derives from three converging features that have no precedent in post-1986 Philippine constitutional history. First, it is a trial of the constitutional successor to the President — a fact that conditions both prosecution strategy and defence framing, since conviction by a two-thirds majority of the Senate would not merely remove the Vice-President but would disqualify her from holding any future office of public trust under Article XI Section 3(7), permanently foreclosing what most contemporary observers consider her highest-probability path to the presidency. Second, it proceeds in parallel with the International Criminal Court's prosecution of the Vice-President's father, former President Rodrigo R. Duterte, who was arrested at Ninoy Aquino International Airport on 11 March 2025 and surrendered to ICC custody at The Hague on 13 March 2025 (covered in PH-D-02 and PH-D-04). Third, the proceedings span two Congresses — the 19th, which transmitted the first articles, and the 20th, which convened on 28 July 2025 after the 12 May 2025 mid-term elections that reshaped the Senate's composition — because the Supreme Court's 25 July 2025 ruling voided the first articles as unconstitutional under the one-year rule, requiring the impeachment to be re-initiated from February 2026 once the bar lapsed.

• The Articles of Impeachment voted by the House plenary on 5 February 2025 enumerated seven counts, organised around five constitutional grounds derived from Article XI Section 2 (the impeachable grounds: culpable violation of the Constitution, treason, bribery, graft and corruption, other high crimes, and betrayal of public trust). The seven counts in summary form were: (1) culpable violation of the Constitution through the November 2024 "assassin" press conference statements and other public acts; (2) betrayal of public trust through the same statements and through the conduct of the Office of the Vice-President; (3) graft and corruption relating to the December 2022 PHP 125 million confidential-funds disbursement and its 19-day liquidation pattern (the Commission on Audit's flagged audit observations and subsequent Notices of Disallowance); (4) bribery in connection with confidential-fund disbursement patterns at the OVP and the Department of Education; (5) other high crimes specifically arising from the 23 November 2024 statement threatening to arrange the assassination of the President, the First Lady, and the Speaker of the House if she herself were killed; (6) high crimes and betrayal of public trust through misuse of public office and abuse of constitutional position; and (7) violation of the constitutional oath of office. The vote on the House floor was 215 affirmative, 0 negative, with 240 representatives signing the verified complaint and articles directly — well above the one-third constitutional threshold of approximately 102 members specified in Article XI Section 3(4) [TBD-VERIFY: precise count of direct signatories versus plenary affirmative-vote count, given contemporaneous press reporting varied between 215 and 240 depending on whether plenary vote or direct signatory tally is being reported]. The transmittal was procedurally automatic under the one-third-signatory rule.

• The procedural-question crisis that consumed February through July 2025 turned on three intertwined questions whose convergence produced one of the most contested institutional moments in post-1986 Philippine constitutional history. First: was the Senate of the 19th Congress, sitting as an impeachment court between 5 February 2025 and the 30 June 2025 expiry of half the Senate's terms, constitutionally required to commence trial proceedings immediately upon transmittal, or could the Senate exercise discretion as to the trial's timing? Second: did an impeachment trial in progress at the end of one Congress carry over to the succeeding Congress, particularly when the Senate's composition was about to be transformed by the 12 May 2025 mid-term elections seating twelve newly elected or re-elected senators on 30 June 2025? Third: were the Articles themselves valid given the question, raised by the OVP defence team in petitions filed at the Supreme Court in February–April 2025, of whether the House had complied with constitutional requirements regarding multiple impeachment complaints in the same year (Article XI Section 3(5) prohibiting initiation of more than one impeachment proceeding against the same official within a one-year period). The 25 July 2025 Supreme Court ruling resolved the controversy at its threshold: by declaring the Articles unconstitutional and void under the one-year rule — and holding that the Senate could not acquire jurisdiction over void articles — it mooted the timing and carry-over questions and foreclosed any trial on the February 2025 Articles.

• Senate President Francis "Chiz" Escudero's procedural reluctance through February–June 2025 to convene the Senate as an impeachment court became the central political controversy of the pre-trial period. Escudero, of the Nationalist People's Coalition (NPC), had ascended to the Senate Presidency on 20 May 2024 following the displacement of Senator Juan Miguel "Migz" Zubiri (Bukidnon) in a leadership reorganisation widely characterised in the press as engineered by the Marcos camp through Senator Joel Villanueva and allied operators. Escudero's public statements through February 2025 emphasised that the Senate would convene as an impeachment court "in due course" but declined to specify a trial date, citing the need for orderly conclusion of legislative business in the 19th Congress's final months. Critics — including former Senate President Zubiri, Senators Risa Hontiveros (Akbayan), Aquilino "Koko" Pimentel III (PDP-Laban), and Francis Pangilinan (Liberal Party until his June 2025 departure for the Senate floor), as well as civic-society coalitions including Akbayan, Bayan Muna's successor formations, the Movement Against Disinformation, and the Philippine Bar Association — characterised Escudero's posture as a procedural blockade designed to insulate the Vice-President from trial during the pre-mid-term window. Defenders characterised it as proper exercise of senatorial procedural discretion under the Rules of Procedure on Impeachment Trials. The dispute supplied much of the procedural matter the Supreme Court was eventually asked to adjudicate.

• The Zubiri reform faction emerged through the February–May 2025 period as the institutional counterweight to Escudero's procedural cautions. Former Senate President Zubiri, joined by Senators Hontiveros, Pimentel, Imee R. Marcos (the President's elder sister, in her own break with the administration line on this question), Sherwin Gatchalian (NPC, but with strong reformist credentials), and a fluctuating bloc of two to three additional senators, filed Senate Resolution No. [TBD-VERIFY: resolution number] on 14 February 2025 calling for the immediate constitution of the impeachment court. The resolution did not command majority support but it established the procedural record of senatorial dissent from the Escudero timetable. Through March, April, and May 2025 the Zubiri faction sustained public pressure through floor statements, media interviews, and coordinated commentary with civic-society groups. The faction's significance proved more than procedural: several of its members, after the 20th Congress convened on 28 July 2025, became among the most influential voices in the chamber's handling of the post-ruling period and the 2026 re-impeachment.

• The 12 May 2025 mid-term elections, conducted ninety-five days after the House impeachment vote and sixty-two days after the ICC arrest of former President Duterte, produced a Senate whose composition was decisive for the conviction arithmetic. Twelve of twenty-four Senate seats were contested. The Marcos-aligned Alyansa para sa Bagong Pilipinas slate won six seats (Senators Erwin Tulfo, Pia Cayetano, Camille Villar, Lito Lapid, and two others [TBD-VERIFY: precise allocation across Alyansa slate, given some candidates' alignment was ambiguous]); the Duterte-aligned slate won five seats (Senators Christopher "Bong" Go, who topped the senatorial race with approximately 27 million votes; Ronald "Bato" Dela Rosa; Rodante Marcoleta; Imee R. Marcos, whose endorsement by the Duterte camp despite her being the President's sister was the cycle's most-discussed defection; and one other Duterte-slate winner); one seat went to a candidate characterised as independent. The resulting Senate composition seated on 30 June 2025 — including the twelve hold-over senators from the 19th Congress whose terms continued through 2028 — produced a body in which approximately ten to eleven senators were classified as Marcos-aligned, approximately seven to eight as Duterte-aligned or Duterte-sympathetic, and the remainder as independent or shifting. The two-thirds conviction threshold (sixteen of twenty-four sitting senators, or sixteen of twenty-three if a senator was disqualified or absent) made the trial's outcome dependent on the alignment of the marginal six to eight senators.

• The 25 July 2025 Supreme Court ruling — delivered by the En Banc three days before the 20th Congress convened — was the proceeding's most consequential single non-Senate institutional event. The Court, in Duterte-Carpio v. House of Representatives, et al. (G.R. No. 278353), ruling unanimously (13–0, with two Justices not participating), declared the Articles of Impeachment unconstitutional and void. On the one-year bar: the Court held that the bar under Article XI Section 3(5) had already been triggered by the impeachment complaints filed against the Vice-President in December 2024, rendering the fourth complaint endorsed by more than one-third of the House on 5 February 2025 invalid. On due process: the Court held that constitutional due process and fairness apply throughout all stages of the impeachment process. On jurisdiction: because the Articles were void, the Senate could not acquire jurisdiction over them, and no trial could proceed. The Court stated that the ruling did not absolve the Vice-President of the charges and that a new complaint could be filed once the bar lapsed on 6 February 2026. The House's motion for reconsideration, filed 4 August 2025, was denied with finality — again unanimously — on 28 January 2026.

• No trial took place under the February 2025 Articles; the impeachment was re-initiated in 2026. The 19th Congress Senate had convened as an impeachment court on 10 June 2025 but voted to remand the articles to the House, requesting certification of compliance with the one-year bar rather than proceeding to trial; the Supreme Court's 25 July 2025 ruling then voided the articles outright, and the new Senate — which retained Escudero as Senate President through the 28 July reorganisation, on a narrower margin and with more contested floor dynamics than in the 19th Congress — had no trial to conduct. After the one-year bar lapsed on 6 February 2026, new impeachment complaints — filed from 2 February 2026 by the Makabayan bloc, by a Tindig Pilipinas–Akbayan–Mamamayang Liberal coalition, by religious leaders (9 February), and by a private complainant (18 February) — were referred to the House Committee on Justice on 23 February 2026, found to state probable cause by the Committee (53–0, 29 April 2026), consolidated into new Articles of Impeachment, and approved by the House plenary 257–25 (with 9 abstentions) on 11 May 2026. The Senate convened as an impeachment court on 18 May 2026, with the trial scheduled to open on 6 July 2026.

• The defence strategy combined four principal lines through 2025–2026: jurisdictional challenge, evidentiary contestation, political mobilisation, and the parallel ICC sovereignty argument. On jurisdiction, the defence preserved its objections to the carry-over ruling, the one-year-bar ruling, and the sufficiency of the Articles, framing the trial as constitutionally infirm even as it participated in the proceedings. On evidence, the defence contested the COA audit findings (arguing that the OVP's confidential-fund liquidations complied with Joint Circular No. 2015-01 and that the audit observations were not findings of malversation), the characterisation of the November 2024 "assassin" statement (arguing that it was rhetorical and conditional, not a literal threat or instigation), and the connection between the COA observations and any constitutional ground for impeachment. On political mobilisation, the defence team and the broader Duterte camp conducted sustained public communications — rallies in Davao City and Mindanao, social-media campaigns coordinated through Duterte Youth and allied formations, and statements by Senators Bong Go, Bato Dela Rosa, Imee Marcos, and other Duterte-aligned senators questioning the political legitimacy of the trial. On the ICC parallel, the defence developed a constitutional argument that the simultaneous prosecution of the Vice-President's father at The Hague — under what the defence characterised as a Marcos-administration political decision dressed as INTERPOL compliance — coloured the trial's legitimacy and supported a finding that the impeachment was politically motivated rather than constitutionally grounded. The prosecution responded that the ICC proceedings and the impeachment were procedurally independent and that the convergence was coincidental.

• The constitutional question of dual ICC and domestic exposure within a single political family is, as of mid-2026, without precedent in any democratic state. The Duterte family confronts, simultaneously: an ICC prosecution of its senior figure (former President Rodrigo Duterte, in pre-trial then trial proceedings at The Hague through 2025–2026, covered in PH-D-02); a Senate impeachment trial of its highest-ranking elected figure (Vice-President Sara Duterte); ongoing domestic criminal investigations by the National Bureau of Investigation, the Department of Justice, and the Ombudsman into former PNP officials and others alleged to have participated in the drug-war operations; and active political competition in the 2025 mid-term and 2028 presidential cycles. The legal and political coordination required of the Duterte camp's counsel and political operators across these parallel proceedings is itself a major analytical problem; the family's response — combining sustained domestic political mobilisation with international and domestic legal challenge — has produced what observers including Coronel (December 2025), Thompson (October 2025), and Teehankee (2025) have characterised as a deliberate strategy of using political mobilisation to constrain the institutional accountability proceedings while using the institutional accountability proceedings to mobilise political support.

• The 2028 presidential succession is the strategic horizon against which all participants in the 2025–2026 trial calibrate their positions. Under Article VII Section 4 of the 1987 Constitution, the President serves a single six-year term without immediate re-election; Marcos Jr.'s term ends 30 June 2028. The contestable scenarios as of mid-2026 include: (a) Sara Duterte as the Duterte-camp standard-bearer if acquitted (or if convicted only on lesser counts not triggering disqualification under Article XI Section 3(7)); (b) Imee R. Marcos as a Marcos-family alternative if Sara is disqualified and if the Marcos camp's preferred candidate fails to consolidate; (c) Senator Christopher "Bong" Go as the Duterte camp's substitute standard-bearer if Sara is disqualified, drawing on his 2025 record-breaking senatorial vote total; (d) a Marcos-administration-chosen successor — variously named in 2025–2026 commentary as Speaker Martin Romualdez, Senator Erwin Tulfo, Senator Joel Villanueva, or Secretary of Finance Ralph Recto [TBD-VERIFY: which figures have been most prominently floated in 2025–2026 administration internal deliberations]; and (e) a non-aligned reformist candidate emerging from the opposition liberal-progressive bloc or from the 2025 senator-judges who break with their factional alignments during the trial. The trial's verdict, whether before or after the 2028 campaign formally opens, will be the central factor structuring the succession.

• The corpus's three-account discipline is applied in this document on three principal contested framings. First: Is the impeachment legitimate accountability or political weaponisation? The administration account characterises it as the operation of constitutional accountability machinery activated by serious public-fiduciary breaches and a public-threat statement; the Duterte loyalist account characterises it as politically engineered persecution by the Romualdez-led House majority and the Marcos camp; the civic-society account, articulated by Bayan, Akbayan, the Philippine Center for Investigative Journalism (PCIJ), and academic critics including Walden Bello and Joel Rocamora, characterises it as a partial accountability moment that is real in its constitutional grounding but selective in its political application. Second: What is Sara Duterte's actual 2028 viability? Pulse Asia survey data through 2025–2026 showed declining presidential-preference numbers (from a 31 per cent plurality in March 2024 to [TBD-VERIFY: precise 2026 plurality]) while the Duterte base remained at sustained 25–30 per cent loyalty; independent political-science analyses including Mendoza, Teehankee, and Thompson emphasised the gap between declining national preference and sustained base loyalty as the analytical frame. Third: Is the ICC prosecution of Rodrigo a sovereignty violation, an accountability win, or a US-aligned move? The Duterte camp characterises it as sovereignty violation through an INTERPOL workaround of constitutional limits; the Karapatan and drug-war-victims advocates characterise it as overdue accountability; external realist analysts including the Asia Society Policy Institute commentary and CSIS Southeast Asia Program briefings emphasise the structural alignment with US Indo-Pacific posture without arbitrating its merits. Section 12 develops each account in parallel without arbitrating which is "primary."

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2. The Pre-Impeachment Context — Confidential Funds, the Quad Committee, and the November 2024 "Assassin" Episode

The Senate trial cannot be read in isolation from the eighteen-month sequence preceding the 5 February 2025 House vote. The institutional mechanics of that sequence are treated at length in PH-D-04 and PH-D-05; this section recapitulates the elements directly load-bearing for the trial's procedural and evidentiary structure.

The proximate predicate of the impeachment is the September 2024 escalation of the confidential-funds controversy surrounding the Office of the Vice-President. The factual core is undisputed: on 21 December 2022, less than six months after the 30 June 2022 inauguration, the Office of the President transferred PHP 125 million from the Contingent Fund of the FY 2022 General Appropriations Act to the Office of the Vice-President, characterised in the OVP submission as confidential expenses governed by Joint Circular No. 2015-01 of the Commission on Audit, the Department of Budget and Management, the Department of the Interior and Local Government, the Governance Commission for GOCCs, and the Department of National Defense. The transfer was completed within eleven calendar days of the OVP's request. The Commission on Audit's Annual Audit Report on the Office of the Vice-President, Fiscal Year 2022, released in September 2023, documented that the entire PHP 125 million had been liquidated by the OVP within roughly nineteen days of receipt — by 9 January 2023, a pattern that COA examiners flagged as inconsistent with normal confidential-fund liquidation across other executive-branch units (NICA, the Office of the President's own confidential funds, the National Security Council, the AFP, and the PNP).

The September–October 2023 budget-hearing cycle, conducted before the House Appropriations Committee under Chair Elizaldy Co (Ako Bicol Party-List) and the Senate Finance Sub-Committee on Confidential and Intelligence Funds under Senator Risa Hontiveros (Akbayan), surfaced the COA observations publicly. The September 2023 House Appropriations exchange between Representative France Castro (ACT Teachers Party-List) and Vice-President Duterte — in which the Vice-President declined to provide detailed liquidation documentation on confidentiality grounds — became the foundational televised moment of the controversy. The FY 2024 General Appropriations Act, signed by President Marcos on 20 December 2023 as Republic Act No. 11975, contained no confidential funds for the OVP and no confidential funds for the Department of Education — the first instance in post-EDSA records of a sitting Vice-President's confidential-fund request being entirely removed from the national budget.

The parallel concern was the Department of Education's PHP 150 million FY 2023 confidential-fund line — an unprecedented inclusion in the budget of an education ministry. Opposition legislators contested it on three grounds: that DepEd had no historical or operational basis for intelligence operations; that NICA and the AFP Intelligence Service held the legal mandate for such operations; and that the inclusion of confidential funds in an education budget represented a category mismatch incompatible with the constitutional priority on basic education (Article XIV Section 1 of the 1987 Constitution). The COA's parallel audit of the DepEd FY 2023 confidential-fund expenditure, surfaced through late 2023 and into 2024, produced further audit observations and eventually Notices of Disallowance issued in the 2024–2025 audit cycle.

The 19 June 2024 resignation of Vice-President Duterte from her concurrent posts as Secretary of Education and as Vice-Chairperson of the National Task Force to End Local Communist Armed Conflict (NTF-ELCAC) was the formal end of the UniTeam as a governing coalition (covered in PH-D-04 Section 5). The Vice-President retained her constitutionally separate elected position; her departure from the cabinet did not, by itself, generate impeachment exposure. But it removed the institutional buffering that the concurrent cabinet position had supplied and opened the political space for the August 2024 escalation.

The August 2024 House Quad Committee hearings — combining the Committees on Public Order and Safety, Dangerous Drugs, Human Rights, and Public Accounts into a single hearing platform — drew sustained testimony through October, November, and December 2024 from former Police Colonel Royina Garma, former Police General Edilberto Leonardo, Senator Antonio Trillanes IV, Edgar Matobato, and Arturo Lascañas, on the operational mechanics of the 2016–2022 drug war (covered in PH-D-02). The hearings did not directly target the Vice-President, but they re-activated the political memory of the Davao Death Squad and the drug-war operations and supplied the evidentiary record that the ICC Office of the Prosecutor under Karim Khan KC was, on parallel track, processing toward an arrest warrant. The political effect was to weaken the Duterte family's broader institutional standing during the months in which the impeachment complaints against the Vice-President were being prepared.

The threshold escalation event was the early-morning press conference of 23 November 2024. In a livestream beginning at approximately 02:30 local time at OVP headquarters in Quezon City, Vice-President Duterte stated — in mixed English and Filipino — that she had spoken with "someone" whom she would identify only as "an assassin" and arranged that, should she be killed, the President, the First Lady Liza Araneta-Marcos, and Speaker Martin G. Romualdez would also be killed. The phrase "no joke" was repeated. Within hours, the OVP characterised the statement as conditional and rhetorical, an expression of personal expectation that "if anything happened" to her certain consequences would follow. The Marcos camp's response was rapid and uniform: Press Secretary Cesar Chavez characterised the statement as a public threat; Speaker Romualdez characterised it as criminal; the Office of the President referred it to the National Bureau of Investigation for inquiry; and the Philippine National Police deployed enhanced security at Malacañang and at the Speaker's residences. The Department of Justice through Secretary Jesus Crispin Remulla announced that criminal-incitement charges were being evaluated.

The first impeachment complaint was filed on 2 December 2024 by a coalition of civic-society and lawyers including Akbayan Party-List leadership, the Philippine Bar Association's Concerned Citizens Group, and individual petitioners including Atty. Joel Butuyan and Atty. Crispin Beltran Jr. The second complaint was filed on 4 December 2024 by a separate coalition including former Education Secretary Bro. Armin Luistro, former Commission on Human Rights Chair Etta Rosales, and former Senator Heherson Alvarez. A third complaint was filed in early February 2025 by a broader civic-society coalition. The three complaints overlapped but were distinct in sponsorship and emphasis. The House Committee on Justice, chaired by Surigao del Sur Representative Romeo Acop, consolidated the complaints in late December 2024 and January 2025 into a single articles-of-impeachment proceeding. The Committee on Good Government and Public Accountability, which had conducted parallel investigations into OVP and DepEd confidential funds, supplied much of the documentary evidentiary base.

The procedural-consolidation question — whether the three complaints constituted a single initiation under Article XI Section 3(5)'s prohibition on initiating more than one impeachment proceeding within a one-year period — became the central pre-trial constitutional question. The OVP defence team began preparing the legal challenge that would ultimately reach the Supreme Court. But before the Supreme Court litigation, the House had to vote.

3. The 5 February 2025 House Impeachment Vote — Procedural Mechanics and the 215-Member Plenary

The 5 February 2025 House plenary vote on the Articles of Impeachment was, by both the procedural mechanism employed and the arithmetic margins achieved, the most decisive impeachment vote in post-1986 Philippine history. The Corona impeachment of December 2011 had been initiated by 188 House signatures meeting the one-third threshold under Article XI Section 3(4); the Sara Duterte articles attracted approximately 240 direct signatures and a plenary affirmative vote of 215, on a House whose effective voting membership at that session was approximately 306 members [TBD-VERIFY: precise reconciliation of the 215 plenary vote, the 240-signature direct-transmittal count widely reported in the press, and the total effective membership of the 19th Congress House at the moment of the vote].

The procedural sequence was the following. On 4 February 2025, the House Committee on Justice, having consolidated the three impeachment complaints and the underlying investigative work product of the Committee on Good Government and Public Accountability, submitted its report to the House plenary. The report, running to several hundred pages with documentary annexes, presented the consolidated articles and recommended transmittal to the Senate. On the morning of 5 February 2025, the House plenary convened and took up the report.

The constitutional architecture of the transmittal mechanism is consequential. Article XI Section 3 of the 1987 Constitution provides two distinct routes for transmittal of impeachment articles to the Senate. Under Section 3(1)–(3), a verified complaint may be filed by any member of the House or by any citizen upon a resolution of endorsement by a member; the complaint is referred to the proper committee, which reports its recommendation to the House; the House then votes, with one-third of its members required to affirm the articles. Under Section 3(4), if at least one-third of the House members file a verified complaint directly or endorse one, "the same shall constitute the Articles of Impeachment, and trial by the Senate shall forthwith proceed." This alternative route bypasses committee review and produces automatic transmittal.

The 5 February 2025 sequence combined both mechanisms in a procedurally complex way. The Committee on Justice's consolidated articles were presented to the plenary for a vote; the plenary affirmative vote was 215, with 0 negative; in parallel and procedurally distinct, 240 House members signed the verified complaint and articles directly, exceeding the one-third constitutional threshold of approximately 102 members. The transmittal to the Senate was therefore procedurally automatic under Section 3(4) regardless of the plenary-vote arithmetic — a feature the prosecution would later emphasise in arguing that the articles' transmittal was constitutionally airtight. Critics in the OVP defence team and in the legal commentariat (including former Supreme Court Justice Antonio Carpio in Inquirer commentary and former Senate President Aquilino Pimentel Jr. in Rappler) raised questions about whether the parallel mechanisms had been properly distinguished and whether the consolidation of three complaints under Section 3(4) was constitutionally permissible. Those questions migrated to the Supreme Court litigation.

The voting record on 5 February 2025 — the named representatives who signed, who voted yes, who abstained, who voted no, and who was absent — became a politically consequential document in its own right. Among the 240 direct signatories were [TBD-VERIFY: representative-level detail on signature composition by party, region, and faction]. The Romualdez-led majority — combining the Speaker's Lakas-CMD bloc with the Nationalist People's Coalition (NPC), the National Unity Party (NUP), the Nacionalista Party (NP), the PFP, and various party-list groups — supplied the overwhelming bulk of the signatures. Duterte-aligned representatives, including Davao del Sur's Paolo "Pulong" Duterte (Rodrigo Duterte's eldest son and former Mayor of Davao City as well as a former Davao City representative), Vincent Crisologo, and the small bloc of PDP-Laban representatives still aligned with the Duterte camp, declined to sign. A handful of representatives across various parties characterised as ambiguous or shifting signed despite their initial expected alignment; this group included representatives whose political calculation reflected the broader Romualdez-faction consolidation of House control.

The absence of negative votes — a 215–0 plenary affirmative vote — was widely characterised at the time as an indicator of the House majority's near-total command. The Duterte-aligned representatives who declined to sign also declined to vote against, choosing absence or abstention as their procedural posture. The political reading at the time was that voting "no" against the Articles in the face of the November 2024 "assassin" statement and the cumulative confidential-funds record would have carried unacceptable political costs for representatives facing 2025 re-election; abstention or absence supplied a politically less exposed alternative.

The transmittal to the Senate occurred the same day. The Articles were transmitted by the House Secretary General to the Senate Secretary, with Speaker Romualdez and the House prosecution panel members in formal procession to the Senate chamber. The Senate received the Articles in formal session, with Senate President Escudero accepting custody of the documents on behalf of the upper chamber. By the close of business on 5 February 2025, the Articles were procedurally before the Senate, and the constitutional requirement that "trial by the Senate shall forthwith proceed" had been formally triggered.

What "forthwith" meant — whether it required the Senate to convene as an impeachment court within days, weeks, or months — became the central procedural question of the next five months. Section 5 develops that question.

4. The Articles of Impeachment — Seven Counts and Their Constitutional Architecture

The Articles of Impeachment transmitted on 5 February 2025 are the procedural and evidentiary spine of the Senate trial. They enumerate seven counts grouped under five constitutional grounds derived from Article XI Section 2 of the 1987 Constitution. That section provides that the President, Vice-President, Members of the Supreme Court, Members of the Constitutional Commissions, and the Ombudsman may be removed from office on impeachment for, and conviction of, "culpable violation of the Constitution, treason, bribery, graft and corruption, other high crimes, or betrayal of public trust."

The seven counts in the Articles, in their summary form:

Count One: Culpable Violation of the Constitution. The first count addresses the 23 November 2024 press conference statements and the broader pattern of conduct alleged to have violated the constitutional oath of office and specific constitutional duties. The "culpable violation" standard requires not merely a violation but an intentional or wilfully blameworthy violation — a distinction grounded in the 1987 Constitutional Commission's deliberations and in the Corona impeachment record. The Articles allege that the statements arranging for retaliatory assassination in the event of the Vice-President's death constituted a wilful violation of Article II Section 2 (renunciation of war and adherence to peace) and Article VII Section 5 (the Vice-Presidential oath to "faithfully and conscientiously fulfil" constitutional duties).

Count Two: Betrayal of Public Trust. The second count is grounded in the same factual record but invokes the distinct constitutional ground of betrayal of public trust, which the 1987 Constitutional Commission introduced as a broader standard than impeachment under prior Philippine constitutions to cover acts that, while not necessarily criminal, are inconsistent with the public-fiduciary character of constitutional office. The Articles allege that the November 2024 statements, the conduct of the OVP through 2023–2024, and the pattern of public conduct relative to the office's fiduciary character together constitute betrayal of public trust. The Count Two architecture is procedurally important because betrayal of public trust does not require a finding of criminal intent; it requires a finding that the conduct is inconsistent with the trust the constitutional position embodies — a lower evidentiary threshold than culpable violation of the Constitution.

Count Three: Graft and Corruption Relating to Confidential-Funds Liquidation. The third count addresses the December 2022 PHP 125 million confidential-fund disbursement to the OVP and its 19-day liquidation pattern, drawing on the COA Annual Audit Report observations and the subsequent Notices of Disallowance. The Articles allege that the liquidation pattern, the documentary deficiencies, and the speed of the liquidation together constitute violations of Republic Act No. 3019 (the Anti-Graft and Corrupt Practices Act) and of the constitutional grounds for impeachment. The Count Three architecture relies heavily on the COA's procedural findings and on the testimony developed before the Senate Finance Sub-Committee under Senator Hontiveros and the House Appropriations Committee under Chair Co. The defence has contested the count on the ground that audit observations and Notices of Disallowance are not, in themselves, findings of criminal liability and that the OVP's liquidation pattern was procedurally compliant with Joint Circular No. 2015-01.

Count Four: Bribery. The fourth count is the most narrowly framed and the most legally contested. The Articles allege specific instances in which OVP and DepEd confidential-fund disbursements were directed in patterns alleged to constitute bribery under Article 210 of the Revised Penal Code (direct bribery) and Article 211 (indirect bribery). The specifics — which named individuals received which payments, in what amounts, for what purposes — are partially redacted in the public Articles given the confidential-fund context; the count never reached trial testimony, the articles having been voided in July 2025, and its substance was re-asserted in the 2026 articles (Section 10). The defence has contested the count both on evidentiary grounds and on legal grounds, arguing that the public-Articles allegations do not specify acts meeting the quid pro quo element required for bribery under Philippine criminal law.

Count Five: Other High Crimes — The November 2024 Statement. The fifth count is the most rhetorically explosive and the one most directly tied to the trigger event of the impeachment. The Articles allege that the 23 November 2024 statement threatening to arrange the assassination of the President, the First Lady, and the Speaker if the Vice-President herself were killed constituted incitement to assassination, conspiracy to commit murder, and threats of grave and immediate harm — together rising to the level of "other high crimes" within the meaning of Article XI Section 2. The constitutional question is whether a public statement of this character, framed in conditional terms, meets the "other high crimes" standard. The 1987 Constitutional Commission did not enumerate what acts qualify as "other high crimes"; the Corona impeachment treated the term elastically. The Sara Duterte trial will be the second post-EDSA opportunity for the Senate impeachment court to articulate what falls within the term.

Count Six: Failure of Constitutional Duties and Misuse of Public Office. The sixth count is a more general count alleging that the pattern of conduct over the Vice-President's term-to-date — including the November 2024 statement, the confidential-fund pattern, the conduct at the 21 November 2024 OVP confrontation with DBM officials, and the broader public conduct relative to the President and the Speaker — together constitute failure of constitutional duties and misuse of the public office. The count's evidentiary requirements are diffuse, drawing on the totality of the record rather than on specific transactional facts. The count's procedural utility for the prosecution is that it permits the case to be presented as a pattern rather than as a series of discrete violations.

Count Seven: Violation of the Constitutional Oath of Office. The seventh count grounds the entire prosecution in the Vice-Presidential oath of 30 June 2022 — the oath to "preserve and defend" the Constitution and to "faithfully and conscientiously fulfil" the duties of the office. The Articles allege that the pattern of conduct documented in Counts One through Six together violated the oath, constituting an independent ground for impeachment. The Count Seven architecture supplies a structural close to the prosecution's case: even if individual counts do not meet the evidentiary thresholds, the totality alleged constitutes oath violation.

The Articles' seven-count architecture is more elaborate than the eight-article Corona Articles of 2011 in some respects (the Corona Articles had eight enumerated articles but were narrower in factual scope) and more compact than the Estrada Articles of 2000 (which were highly detailed on specific transactional allegations relating to the "jueteng" gambling money). The Sara Duterte Articles cover a mix of constitutional, criminal, and broader fiduciary grounds, reflecting both the diversity of the underlying conduct alleged and the prosecution's procedural strategy of preserving multiple constitutional pathways to conviction.

The defence response to the Articles, articulated in pre-trial filings and in opening trial statements through 2025, contested each count on multiple grounds. On Count One, the defence argued that the November 2024 statement was rhetorical and did not meet the wilful-violation standard. On Count Two, the defence argued that the conduct alleged did not constitute betrayal of public trust within the meaning of the Constitutional Commission's deliberations. On Count Three, the defence argued that the COA audit observations did not establish criminal conduct and that the liquidation pattern was procedurally compliant. On Count Four, the defence argued that the bribery allegations were unsupported by specific quid pro quo facts. On Count Five, the defence argued that the November 2024 statement, as a matter of legal construction, did not constitute incitement, conspiracy, or threat under Philippine criminal law and that, even if it did, "other high crimes" does not extend to public statements of this character. On Count Six, the defence argued that the diffuse pattern allegation was constitutionally insufficient for impeachment. On Count Seven, the defence argued that oath violation is not an independent ground for impeachment under Article XI Section 2 — it is the consequence of conviction on one of the enumerated grounds, not an independent ground itself.

The Senate impeachment court will resolve these contested grounds through its evidentiary rulings, its procedural conduct of the trial, and ultimately its count-by-count verdict. The prosecution's strategy through 2025–2026 has been to develop each count's evidentiary record fully while preserving the structural argument that the totality of conduct constitutes oath violation; the defence's strategy has been to contest each count individually while preserving the structural argument that the trial is constitutionally and politically infirm. Section 10 develops the trial-in-session evidentiary record; Section 12 develops the contested framings of legitimacy.

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5. The Pre-Trial Procedural Crisis — The Senate's Reluctance to Convene as an Impeachment Court

The procedural crisis that consumed February through late July 2025 was the most institutionally consequential pre-trial phase in Philippine impeachment history. Its core was a constitutional ambiguity in Article XI Section 3(4): the provision states that upon transmittal of articles by one-third House signature, "trial by the Senate shall forthwith proceed," but it does not define "forthwith" — whether days, weeks, or months — and it does not specify the procedural sequence by which the Senate transforms itself from a legislative body into an impeachment court.

The 1987 Constitution and the Senate's own Rules of Procedure on Impeachment Trials (most recently adopted in 2011 for the Corona impeachment and not substantively revised since) provide a procedural framework that requires the following sequence: (a) receipt by the Senate of the Articles from the House; (b) reading of the Articles in the Senate chamber; (c) the Senate sitting as a Court of Impeachment, with its members taking a special oath as senator-judges; (d) issuance of summons to the respondent (the Vice-President in this case) requiring appearance and answer; (e) the respondent's answer or appearance; (f) opening of the trial-in-chief. The 2011–2012 Corona impeachment compressed this sequence into roughly six weeks between House transmittal and trial commencement. The Sara Duterte sequence stretched it across six months.

Senate President Francis "Chiz" Escudero (Nationalist People's Coalition, Sorsogon) had ascended to the Senate Presidency on 20 May 2024 in a leadership reorganisation that displaced his predecessor Juan Miguel "Migz" Zubiri (Bukidnon). Escudero's accession was widely characterised in the press as engineered by Marcos camp operators including Senator Joel Villanueva (PFP, Bulacan-affiliated) and was treated as a signal of consolidating Marcos influence over the upper chamber. In the days after the 5 February 2025 transmittal, Escudero's public position was that the Senate would convene as an impeachment court "in due course" but that it would not abandon legislative business in the 19th Congress's final months. The Senate's calendar through February, March, April, and May 2025 was dominated by ordinary legislative work, including the FY 2025 supplemental budget process, the Maharlika Investment Fund operational legislation, and other items.

The Escudero position drew immediate criticism. On 14 February 2025, former Senate President Zubiri and a fluctuating bloc of senators — including Senators Risa Hontiveros (Akbayan), Aquilino "Koko" Pimentel III (PDP-Laban, of the Pacquiao-distinct faction), Sherwin Gatchalian (NPC), Francis Pangilinan (Liberal Party), Nancy Binay (UNA, on this question), and Imee R. Marcos (the President's sister, in her own break with the administration line) — filed Senate Resolution No. [TBD-VERIFY: resolution number] calling for the immediate constitution of the impeachment court and the commencement of trial proceedings. The resolution was assigned to the Senate Rules Committee, where it sat for several weeks. A second, more pointed resolution was filed in March 2025. Neither commanded majority support, but together they established a procedural record of senatorial dissent from the Escudero timetable.

The civic-society response was substantial. Akbayan Party-List, the Movement Against Disinformation, the Philippine Bar Association's Concerned Citizens Group, the Concerned Lawyers for Civil Liberties (CLCL), the Catholic Bishops' Conference of the Philippines through specific bishop statements (including Manila Auxiliary Bishop Broderick Pabillo, Caloocan Bishop Pablo David, and Cubao Bishop Honesto Ongtioco), Karapatan, Bayan and its successor formations, the Philippine Center for Investigative Journalism (PCIJ), and Rappler's editorial collective sustained public pressure through statements, rallies, and op-ed commentary calling for the immediate commencement of trial. The framing across these civic-society interventions was that delay was institutional cowardice and that the constitutional requirement of "forthwith" was being violated by Escudero's procedural calculation.

The Marcos administration's public posture through this period was studied non-interference: President Marcos's public statements characterised the Senate's procedural conduct as a matter within the upper chamber's institutional discretion and declined to comment on the timing. Press Secretary Cesar Chavez and other administration spokespersons maintained a similar posture. Critics in the OVP defence and in the Duterte loyalist coalition characterised this posture as a deniable strategy that permitted the Escudero faction to delay trial through the pre-mid-term window while preserving the administration's plausible distance from the Senate's procedural conduct.

The Duterte camp's posture through the same period combined two strategies. On one hand, the camp publicly demanded immediate trial, framing delay as evidence that the prosecution's case was weak and that the administration was politically motivated. On the other hand, the OVP defence team filed Supreme Court petitions seeking to invalidate the Articles entirely on the one-year-bar and consolidation grounds — petitions that, if successful, would obviate any trial. The dual strategy was internally tensioned: demanding immediate trial while simultaneously seeking to abort the trial through the Supreme Court was a politically explicable but legally complex posture. The OVP camp's principal political-communications message — that the Vice-President was being denied her constitutional right to a prompt trial that she nevertheless considered constitutionally infirm — was articulated by senators Bong Go, Bato Dela Rosa, and Imee Marcos in floor statements and media appearances.

By late April 2025, with the 12 May 2025 elections two weeks away, the Senate had still not formally convened as an impeachment court. Escudero's procedural position by this stage was that the Senate would address the trial question after the mid-term elections, in the new 20th Congress to be seated on 30 June 2025. Critics characterised this as a deliberate strategy to avoid trial conduct during the pre-election political environment; supporters characterised it as procedurally orderly given the Supreme Court pendency and the administrative burden of transitioning Senate composition.

The May–July 2025 period was the procedural crisis's most acute phase. The 12 May 2025 elections produced the new Senate composition (Section 9). The 30 June 2025 inauguration of the new senators and the 28 July 2025 convocation of the 20th Congress in regular session reset the political and procedural baseline. And the 25 July 2025 Supreme Court ruling, delivered three days before the new Congress convened, resolved the constitutional questions that had been pending throughout the period by voiding the Articles (Section 7).

6. The Sara Duterte Supreme Court Petition and the Pendency Period (February – July 2025)

The OVP defence team's Supreme Court litigation strategy emerged in the second week of February 2025 and developed across multiple petitions filed between February and April. The lead petition was filed on 18 February 2025 [TBD-VERIFY: precise filing date and docket number of the lead OVP petition], styled In the Matter of the Petition of Vice-President Sara Z. Duterte-Carpio v. Senate of the Philippines, House of Representatives, et al. — a special civil action for certiorari and prohibition under Rule 65 of the Rules of Court, with prayer for temporary restraining order against further Senate action on the Articles.

The petition's principal legal grounds were three. First, the one-year-bar argument: that Article XI Section 3(5) of the 1987 Constitution provides that "No impeachment proceedings shall be initiated against the same official more than once within a period of one year," and that the three separate complaints filed on 2 December 2024, 4 December 2024, and February 2025 constituted three separate initiations, the second and third of which were constitutionally barred. Under this argument, the consolidated articles incorporated content from initiations beyond the one-year bar's permissible scope and were therefore invalid in their entirety. The argument drew on the 2003 Supreme Court decision in Francisco v. House of Representatives (G.R. No. 160261) — the foundational post-EDSA construction of the one-year-bar — and on subsequent jurisprudence.

Second, the consolidation insufficiency argument: that even if the consolidation of three complaints into a single proceeding might in principle be procedurally permissible, the House Committee on Justice's particular consolidation had not adequately distinguished between the constitutionally permissible content (drawn from a single permissible initiation) and the constitutionally impermissible content (drawn from the barred initiations), and that the entire articles were therefore tainted by procedural defect.

Third, the signature-count and verification argument: that the 240 reported direct signatures had not all been properly verified under the requirements applicable to House-member complaints under Article XI Section 3(2), and that the procedural-automatic-transmittal mechanism of Section 3(4) had therefore been improperly invoked. This argument was the most technically detailed and the most contested in subsequent commentary.

The petition was filed with the Supreme Court En Banc; under the Court's rules and traditions, impeachment-process petitions are heard En Banc rather than in division. The Court's initial response, on 19 or 20 February 2025 [TBD-VERIFY: precise date of the initial Supreme Court action on the petition], was to require the respondents (the Senate, the House of Representatives, and the named individual respondents) to comment on the petition within a specified period and to set an oral arguments date. The Court did not at this stage issue a temporary restraining order on Senate proceedings; nor did it dismiss the petition.

The oral arguments occurred on [TBD-VERIFY: oral arguments date(s) in March or April 2025]. The petitioners were represented by the OVP defence team led by former Executive Secretary Salvador C. Medialdea and Atty. Martin Loon Delgra III, with constitutional-law specialists including [TBD-VERIFY: identity of constitutional-law counsel argued on behalf of OVP]. The respondents were represented by the Office of the Solicitor General under Solicitor General Menardo Guevarra (a former Justice Secretary under Duterte who had moved to the Solicitor General role under Marcos) and by counsel for the House and Senate respectively. The Solicitor General's posture was institutionally interesting: as a former Justice Secretary under the prior administration but as the current Marcos administration's Solicitor General, Guevarra's argumentation on the impeachment was widely watched. The OSG argued that the consolidation was constitutionally permissible, that the Articles were validly transmitted, and that the Court should defer to the Senate's procedural conduct of the trial.

The pendency of the Supreme Court litigation through February–July 2025 had three procedural consequences. First, it supplied Senate President Escudero with a procedural justification — though not a constitutional requirement — for delaying the Senate's convocation as an impeachment court: the argument that the Senate should not commence trial on Articles whose validity was under Supreme Court review. Second, it concentrated the OVP defence team's legal and communications resources on the Supreme Court litigation rather than on trial-preparation work, supplying a strategic advantage that the defence calculated outweighed the cost of pendency-period delay. Third, it transformed the constitutional question of trial-court convocation into a constitutional question that included the Articles' validity, expanding the procedural and political stakes of the eventual Supreme Court ruling.

Additional petitions were filed in March and April 2025, including petitions by third parties (civic-society organisations as petitioners-in-intervention, House minority members, and academics) raising parallel and tangentially related questions. The Court consolidated these into a single docket for resolution. By the end of April 2025, the consolidated petitions had been fully briefed and oral arguments completed; the case was submitted for decision; the only outstanding institutional question was the timing of the Court's ruling.

The Court's institutional posture through May, June, and July 2025 was the subject of intense political speculation. Chief Justice Alexander G. Gesmundo and the Associate Justices were closely watched for signals on the likely outcome. The Court had under its consideration both the impeachment-related petitions and the parallel petitions concerning the ICC arrest and surrender of former President Duterte (filed in March 2025 immediately after the arrest), and the timing of rulings on the two sets of petitions was itself politically consequential. The Court's eventual decision to resolve the ICC-related petitions first (in March–May 2025, with the Court declining to issue restraining orders on the surrender and subsequently ruling on the jurisdictional and admissibility questions) and the impeachment-related petitions second (on 25 July 2025) was widely read as an institutionally cautious sequencing.

The Supreme Court's June and July 2025 schedule included deliberations on the impeachment petitions during the same weeks that the new 20th Congress's Senate composition was being seated (30 June 2025) and the 20th Congress was preparing to convene (28 July 2025). The Court's 25 July 2025 ruling — delivered three days before the 20th Congress convened — meant the new Congress opened with the constitutional question already resolved against the Articles.

7. The 25 July 2025 Supreme Court Ruling — The One-Year Bar, Due Process, and the Voiding of the Articles

The Supreme Court's 25 July 2025 ruling in Duterte-Carpio v. House of Representatives, et al. (G.R. No. 278353) is, as of mid-2026, the most consequential single Supreme Court decision of the Marcos administration. The En Banc, voting unanimously among those participating (13–0, with two Justices not taking part), declared the Articles of Impeachment against the Vice-President unconstitutional and void. PH-I-01 Section 6 carries the jurisprudential analysis; this section records the holdings and their effect on the Senate proceeding.

Holding One: The One-Year Bar. The Court held that the one-year bar of Article XI Section 3(5) — "No impeachment proceedings shall be initiated against the same official more than once within a period of one year" — had already been triggered by the impeachment complaints filed against the Vice-President in December 2024, which the House leadership had held unacted in the Committee on Justice. The fourth complaint, endorsed by more than one-third of the House membership and transmitted as the Articles of Impeachment on 5 February 2025, was therefore barred and invalid. The Court rejected the House position that the December complaints, never referred to plenary, had not "initiated" proceedings in the constitutionally relevant sense.

Holding Two: Due Process. The Court held that constitutional due process and fairness apply throughout all stages of the impeachment process, including the House initiation phase — a holding the House prosecution and many commentators read as adding a judicially enforceable fairness layer to a process Article XI textually commits to Congress.

Holding Three: Jurisdiction. Because the Articles were unconstitutional and void, the Senate could not acquire jurisdiction over them; no impeachment trial could proceed. The carry-over and timing questions that had dominated the February–July 2025 procedural crisis were thereby mooted: there was nothing to carry over and nothing whose timing required adjudication.

The Court added two clarifications that framed the aftermath. The ruling did not absolve the Vice-President of any of the charges; and a new impeachment complaint could be filed once the one-year bar lapsed, which the Court placed at 6 February 2026.

The decision's reception was sharply divided along the by-then-familiar coalition fault line — but with the camps' positions inverted from the pre-ruling alignment. The Duterte camp characterised the ruling as vindication of constitutional limits against a weaponised House supermajority. The House prosecution panel, constitutional scholars, and civic-society groups criticised it as a "constitutional escape hatch": if the one-year bar is triggered by earlier complaints the House never acted on, then an official's allies can file a sacrificial complaint each year and render the official impeachment-proof — converting a shield against harassment into a sword against accountability. Defenders of the ruling called it a textually faithful, due-process-grounded reading that punished the House for gaming its own referral timetable. PH-I-01 Section 6 develops both readings.

The House of Representatives filed a motion for reconsideration on 4 August 2025. The Court denied it with finality on 28 January 2026, again by a unanimous vote of the participating Justices, affirming that the Articles were void and that any new complaint could be filed only from 6 February 2026. The decision's most consequential immediate effect was therefore the termination, not the unblocking, of the Senate proceeding: the impeachment court that the 19th Congress Senate had convened on 10 June 2025 — and which had voted to remand the articles to the House for certification of compliance with the one-year bar — was left with nothing to try, and the accountability contest moved to the question of re-filing once the bar lapsed (Section 10).

8. The Senate Presidency Contest — Escudero, Zubiri, and the 20th Congress Reorganisation

The 28 July 2025 convocation of the 20th Congress required a Senate-presidency reorganisation. Under Philippine senatorial practice, the Senate elects its President at the opening of each Congress; the Senate President serves at the pleasure of the chamber and may be displaced at any time by majority vote. The 19th Congress's Escudero-led Senate Presidency — itself the product of a May 2024 reorganisation displacing Zubiri — was therefore institutionally re-opened with the 20th Congress's convocation.

The pre-convocation manoeuvring through June and July 2025 was intense. The Marcos camp's preferred outcome was a continuation of the Escudero presidency, with the senate's procedural posture on the impeachment trial preserved within Escudero's institutional command. The Zubiri reform faction's preferred outcome was the displacement of Escudero in favour of a Senate President more institutionally committed to expeditious trial conduct. The Duterte camp's preferred outcome was more complex: while the Duterte camp had welcomed Escudero's procedural delays through February–July 2025, the camp's strategic calculation under the post-mid-term arithmetic shifted; Duterte-aligned senators began to calculate whether a Senate President more institutionally independent might produce a trial conducted on procedural grounds favourable to the defence even if the trial commenced expeditiously.

The 28 July 2025 vote retained Escudero as Senate President, but on a narrower margin than in May 2024. The vote tally was [TBD-VERIFY: precise vote count and identity of senators voting for and against Escudero]. Senators voting against Escudero or abstaining included Zubiri, Hontiveros, Pimentel, Imee Marcos, and a fluctuating group of two to three additional senators. The narrow margin signalled that the Escudero presidency would operate in the 20th Congress under more contested floor dynamics than in the 19th Congress.

The Senate Majority Leader (a procedurally significant position with control of the daily legislative and trial calendar) was retained by [TBD-VERIFY: 20th Congress Majority Leader identity]. The Senate Minority Leader, historically a position held by an opposition-aligned senator, was held by [TBD-VERIFY: Minority Leader identity and party affiliation]. The chairmanships of key committees — including the Committee on Justice and Human Rights, the Committee on Rules, the Committee on Finance, the Committee on Foreign Relations, and the Committee on National Defense — were reallocated through the 28 July reorganisation, with the impeachment-trial-relevant committees (Justice and Human Rights, Rules) attracting particular attention.

Escudero's institutional posture on the impeachment in the 20th Congress was reshaped by the Supreme Court's 25 July 2025 ruling. With the Articles voided, the Senate had no trial to conduct, and Escudero's public statements through August 2025 emphasised deference to the Court's resolution and the orderly disposition of the now-void articles. Critics read the outcome as the retrospective vindication of a procedural blockade that had run out the clock until the judiciary disposed of the case; supporters read it as confirmation that Escudero's cautions about the articles' constitutional infirmity had been correct all along.

The factional contest in the 20th Congress Senate therefore shifted from trial procedure to the post-ruling questions: whether to support the House's motion for reconsideration politically, how to dispose of the remanded articles, and how to position for a possible re-filing after 6 February 2026. Escudero's tenure did not survive the period's broader turbulence: on 8 September 2025 the Senate declared the presidency vacant and elected Vicente "Tito" Sotto III as Senate President, with the handling of the impeachment among the grievances cited alongside the flood-control-projects controversy [TBD-VERIFY: the full motive set and vote configuration of the 8 September 2025 reorganisation].

9. The Post-Mid-Term Senate Composition and the Sixteen-Vote Conviction Arithmetic

The Senate composition seated on 30 June 2025 is the operational determinant of any impeachment trial's outcome — including the trial on the 2026 articles scheduled to open on 6 July 2026. The two-thirds conviction threshold under Article XI Section 3(6) — sixteen of twenty-four sitting senators — converts a trial's verdict into an arithmetic problem whose solution depends on the alignment of individual senator-judges across factional lines.

The twenty-four senators of the 20th Congress fall into approximate alignment groups as of mid-2026, with substantial uncertainty in the marginal cases:

Marcos-aligned (approximately 10–11 senators). This group includes Senator Joel Villanueva (PFP, Bulacan, generally counted as the administration's principal senatorial operator); Senator Loren Legarda (NPC, multiple-term incumbent with consistent administration alignment); Senator Mark Villar (Nacionalista, Las Piñas dynasty); Senator Camille Villar (newly elected in 2025, of the same dynasty); Senator Erwin Tulfo (newly elected 2025, drawing on the Tulfo-family media base); Senator Pia Cayetano (Nacionalista, Taguig dynasty, with general administration alignment); Senator Lito Lapid (NPC, with administration alignment); Senator JV Ejercito (NPC, son of former President Estrada, with administration alignment notwithstanding his father's pre-2025 ambiguity); [TBD-VERIFY: two to three additional Marcos-aligned senators including possibly Senator Win Gatchalian on the conviction question, Senator Cynthia Villar if hold-over status, and others].

Duterte-aligned or Duterte-sympathetic (approximately 7–8 senators). This group includes Senator Christopher "Bong" Go (newly re-elected 2025 as the senatorial-race top vote-getter with approximately 27 million votes); Senator Ronald "Bato" Dela Rosa (re-elected 2025, Duterte's former PNP Chief); Senator Rodante Marcoleta (newly elected 2025 from Duterte-affiliated party list); Senator Imee R. Marcos (re-elected 2025, the President's elder sister whose endorsement by the Duterte camp made her the most-watched Senate-trial vote); Senator [TBD-VERIFY: one additional Duterte-slate senator elected May 2025]; Senator Robin Padilla (PDP-Laban, with consistent Duterte alignment); [TBD-VERIFY: one or two additional Duterte-aligned hold-over senators].

Independent or reform-faction (approximately 5–6 senators). This group includes Senator Risa Hontiveros (Akbayan, consistently in the opposition bloc but on the impeachment question generally aligned with the prosecution); Senator Juan Miguel "Migz" Zubiri (Bukidnon, of NPC origin but post-displacement aligned with the reform faction; on the impeachment question consistently for trial); Senator Aquilino "Koko" Pimentel III (PDP-Laban Pacquiao-distinct faction, on the impeachment question for trial); Senator Sherwin Gatchalian (NPC, with reform credentials and on the impeachment question for trial); Senator [TBD-VERIFY: one to two additional independent or shifting senators].

The conviction arithmetic depends, in the principal scenarios, on whether the Marcos-aligned and the independent-reform-faction groups together command sixteen votes for conviction on at least one count. The Marcos-aligned group of approximately 10–11 supplies the core; the independent-reform-faction of approximately 5–6 supplies the marginal votes. The Duterte-aligned group of approximately 7–8 supplies the core no-vote bloc.

The most-watched marginal senators across 2025–2026 analytic commentary include Imee Marcos (whose Duterte-camp alignment may shift on specific counts despite her general alignment); Pia Cayetano (whose Cayetano-dynasty considerations and Marcos alignment may diverge); JV Ejercito (whose Estrada-family considerations and Marcos alignment may diverge); Joel Villanueva (whose Marcos alignment is consistent but whose conviction posture on specific counts is uncertain); and the independent-reform faction members on specific evidentiary thresholds.

The procedural design under the Rules of Procedure on Impeachment Trials permits separate votes on each count. A two-thirds vote on any single count is sufficient for conviction, with conviction triggering removal from office and disqualification from future office under Article XI Section 3(7). The defence's strategic calculation has been that the marginal-vote arithmetic on Counts Three (graft and corruption) and Count Four (bribery) — counts with the most concrete documentary record but also the most contested evidentiary thresholds — is the trial's principal point of conviction risk. The prosecution's strategic calculation has been that Count Five (the November 2024 statement) and Count One (culpable violation) supply the most-compelling-to-senator-judges narrative grounds for conviction.

Pulse Asia Research polling through 2025–2026 has tracked public support for conviction at consistently elevated levels: 51 per cent in March 2025; 58 per cent in June 2025; 56 per cent in September 2025; 54 per cent in December 2025; [TBD-VERIFY: March 2026 figure]. Social Weather Stations polling has tracked similar levels with slight methodological variations. The public-support level is not directly an institutional input to the Senate's verdict but supplies the political backdrop within which senator-judges calibrate their positions.

The trial's calendar — opening statements, prosecution case-in-chief, defence case-in-chief, rebuttal, closing arguments, and verdict — has been projected through 2025–2026 to extend across approximately six to twelve months of trial sessions. The Corona impeachment of 2011–2012 was completed in approximately five months; the Sara Duterte trial's more extensive evidentiary record, more elaborate seven-count structure, and more contested procedural posture have produced a longer projected schedule. The verdict timing — whether before the 2028 campaign's formal opening in late 2027, during the campaign, or after a possible 2028 candidacy by the Vice-President — is itself politically consequential.

10. From Voided Articles to the 2026 Re-Impeachment — Remand, Finality, and the Road to a July 2026 Trial

No trial was ever held on the February 2025 Articles. The procedural endgame of the first impeachment ran as follows. On 10 June 2025, the 19th Congress Senate convened as an impeachment court but, rather than proceeding to trial, voted to remand the articles to the House of Representatives, requesting certification that the articles did not violate the one-year bar of Article XI Section 3(5) — a step the prosecution camp condemned as a functional dismissal and the Escudero leadership defended as constitutional prudence. The Supreme Court's 25 July 2025 ruling (Section 7) then voided the articles outright, holding that the Senate could not acquire jurisdiction over them. The House filed a motion for reconsideration on 4 August 2025; the Court denied it with finality, again unanimously among the participating Justices, on 28 January 2026. The first impeachment was dead.

The Court's own ruling, however, had marked the path forward: the one-year bar lapsed on 6 February 2026, from which date a new impeachment complaint could validly be filed. The re-initiation came immediately. On 2 February 2026, two complaints were filed — one by the Makabayan bloc, one by a coalition including Tindig Pilipinas, Akbayan, and Mamamayang Liberal; a third complaint by religious leaders followed on 9 February, and a fourth by lawyer Nathaniel Cabrera on 18 February. On 23 February 2026 the complaints were formally referred to the House Committee on Justice, initiating the second impeachment proceeding within the constitutional sequence the Court had prescribed.

The House process on the second impeachment was deliberate where the February 2025 process had been compressed — a procedural posture widely read as designed to survive the due-process scrutiny the Court's 2025 ruling had introduced. The Committee on Justice found probable cause by a 53–0 vote on 29 April 2026, consolidated the complaints into a single set of Articles of Impeachment, and approved its report 55–0 on 4 May 2026. On 11 May 2026 the House plenary voted 257–25, with 9 abstentions, to impeach the Vice-President, and the articles were transmitted to the Senate. The grounds — betrayal of public trust, culpable violation of the Constitution, graft and corruption, and bribery — re-asserted the substance of the 2025 case: the confidential-funds record at the OVP and the Department of Education, alleged unexplained wealth, and the November 2024 threats against the President, the First Lady, and the Speaker.

The Senate convened as an impeachment court on 18 May 2026, with the trial scheduled to open on 6 July 2026. The configuration of the prosecution and defence panels for the 2026 trial, the impeachment court's procedural rulings, and the trial calendar's interaction with the 2028 succession timetable [TBD-VERIFY: the 2026 trial's panel compositions, presiding-officer arrangements, and procedural framework as adopted from May 2026] are matters for subsequent corpus updates. As of this document's May 2026 cutoff, the trial-in-chief had not yet opened and no verdict existed. Section 10.1 carries the trial-in-session record through the document's 29 August 2026 recency-sweep update.

10.1 The Trial-in-Session Record, July–August 2026 [Recency-sweep update, 2026-08-29]

The trial-in-chief opened on schedule on 6 July 2026, corroborated across multiple contemporaneous outlets (Al Jazeera, Courthouse News Service, the Philippine Daily Inquirer, and GMA News Online). Through July and into late August 2026 the Senate impeachment court sat on a rolling schedule of trial sessions (GMA News Online's "LIVE UPDATES" series and the Inquirer's "WATCH" series each tracked individual session dates, including 3 August, 4 August, 11 August, 12 August, 24 August, 25 August, and 26 August 2026), with the prosecution's case-in-chief through this period concentrated on the confidential-funds counts (Counts Three and Four, Section 4) rather than on the November 2024 "assassin" statement counts.

The principal prosecution witnesses documented in this period, per search-corroborated GMA News Online and Inquirer reporting, included: Xylene del Campo of the Commission on Audit's Intelligence and Confidential Funds Audit Office (ICFAO), who testified on the disbursement of confidential funds by the Office of the Vice-President and the Department of Education during Vice-President Duterte's tenure, and who stated that confidential operations are not part of the mandate of either the OVP or the DepEd secretary; Atty. Roderick Wamil, a former COA state auditor from the same ICFAO office, who testified regarding an Audit Observation Memorandum covering DepEd's confidential-fund use for the periods 20 February–30 March 2023 and 20 April–29 June 2023; former OVP special disbursing officer Gina Acosta, questioned over her inability to recall details concerning the confidential funds of Davao City during Vice-President Duterte's mayoralty; and OVP Assistant Chief of Staff Lemuel Ortonio, who testified — on what press reporting characterised as the eighteenth trial day — regarding the processing and use of OVP confidential funds from the fourth quarter of 2022 through the third quarter of 2023. [TBD-VERIFY: this witness list and the "Day 18" session-count characterisation are search-corroborated across GMA News Online and Inquirer.net coverage dated 3–26 August 2026, but have not been independently fetch-verified against the Senate impeachment court's own session transcripts or journal in this update; the precise dates on which each witness appeared, and the full defence cross-examination record, remain to be closed by a subsequent research wave with primary-document access.]

As of 26 August 2026 — the most recent date for which this update found corroborated coverage — no verdict had been rendered on any of the four counts, and no public reporting located in this sweep indicated that the prosecution's case-in-chief had closed. The sixteen-vote conviction arithmetic set out in Section 9 remained, on the available record, unresolved; this update did not identify any published senator-by-senator vote count, since no vote had yet been taken. The trial's continuation through August 2026 — nearly two months into a proceeding the 2011–2012 Corona precedent had completed in roughly five months — is consistent with the longer schedule this document projected in Section 9, given the more extensive evidentiary record on the confidential-funds counts.

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11. The Parallel ICC Prosecution of Rodrigo Duterte and Its Effect on the Trial

The 11 March 2025 arrest of former President Rodrigo Roa Duterte at Ninoy Aquino International Airport's Terminal 3 — executed on the ICC Pre-Trial Chamber I arrest warrant of 7 March 2025 and followed by surrender to ICC custody at The Hague on 13 March 2025 — proceeded in operational parallel with the impeachment of his daughter. The arrest's full procedural details are covered in PH-D-02 (the war on drugs document) and PH-D-04 Section 8 (the coalition rupture document); this section addresses the arrest's specific implications for the Senate trial of Vice-President Duterte.

Three structural effects of the ICC arrest on the Senate trial bear examination.

The political-narrative effect. The 11 March arrest, occurring sixty-two days before the 12 May 2025 mid-term elections and 136 days before the 25 July 2025 Supreme Court ruling that voided the Articles of Impeachment, supplied the defence with a politically resonant framing of the Marcos administration's broader conduct toward the Duterte family. The defence narrative — that the administration was conducting a coordinated campaign against the Duterte dynasty, with the ICC arrest and the impeachment as parallel instruments — drew rhetorical strength from the operational coincidence of the two proceedings. The prosecution narrative — that the ICC and impeachment proceedings were procedurally independent and that the convergence was coincidental — drew on the formal-procedural separation of the two cases. Both narratives circulated in 2025–2026 public commentary and in trial-related public-opinion polling; neither could be definitively confirmed or refuted by the available record.

The evidentiary-overlap effect. The factual record developed in the Quad Committee hearings of August–December 2024 — including testimony from Royina Garma, Edilberto Leonardo, Edgar Matobato, Arturo Lascañas, and others — supplies evidentiary material for both the ICC prosecution of Rodrigo Duterte and a separate but parallel evidentiary thread in the Sara Duterte trial. The Sara Duterte Articles do not formally include drug-war-era conduct charges (the conduct alleged against the Vice-President is distinct from her father's), but the broader political-evidentiary context — the Davao Death Squad record, the drug-war command structure, the Duterte-family political fabric within which the Vice-President's office operates — has been drawn upon by the prosecution in contextualising specific counts. The defence has contested this evidentiary overlap as politically prejudicial; the prosecution has argued that the contextual evidence is relevant to the constitutional grounds asserted.

The succession-incentive effect. The ICC prosecution of Rodrigo Duterte, by removing the family's senior figure from active Philippine politics through indefinite Hague custody, has concentrated the family's political fortunes on the Vice-President as the principal remaining elected dynasty member. The political and family-strategic incentives to defend the Vice-President's office have, accordingly, intensified across the trial period. The Vice-President's own political calculation — including her decisions about defence strategy, public-mobilisation posture, and 2028 candidacy — must be read against the family's compressed remaining dynasty platform. The compression is both a political incentive to fight the trial to acquittal and a political risk that an acquittal achieved at the cost of significant political capital may produce a Pyrrhic outcome relative to 2028 prospects.

The ICC proceedings' own progress through 2025–2026 has supplied additional inflection points for the Senate trial's political environment. The Confirmation of Charges Hearing at the ICC — held on [TBD-VERIFY: confirmation hearing date in late 2025 or early 2026] — produced a Pre-Trial Chamber I decision on whether the charges against Rodrigo Duterte would proceed to trial. The decision's content, the public reception of the Pre-Trial Chamber's reasoning, and the political response in the Philippines all supplied contextual matter for the Senate trial. The ICC trial's commencement — projected for [TBD-VERIFY: trial commencement projection] — will, when it occurs, produce a sustained period of public attention on Rodrigo Duterte's prosecution in parallel with the late stages of the Sara Duterte trial.

The Marcos administration's posture on continued ICC cooperation through 2025–2026 has remained consistent with the March 2025 framing: that cooperation is the operation of independent INTERPOL channels and not a political decision. Critics have contested this framing through 2025–2026; the Supreme Court's resolution of the multiple petitions filed in March–May 2025 concerning the ICC arrest and surrender produced rulings broadly favourable to the administration's framing, though with [TBD-VERIFY: specific Supreme Court holdings on the ICC-arrest petitions] dissenting opinions raising concerns about constitutional limits on cooperation with international courts after Rome Statute withdrawal.

The legal-strategic coordination between the ICC defence team for Rodrigo Duterte (led at the international level by Nicholas Kaufman and Salvador Medialdea, with subsequent counsel additions) and the impeachment defence team for Sara Duterte (led by Medialdea, Delgra, and others) has been substantial. Medialdea's dual role as senior counsel in both cases supplies the most visible institutional link; broader coordination on factual presentation, public-communications messaging, and political-mobilisation strategy has been documented across press reporting and academic commentary.

The trial verdict and the ICC trial outcome — whose timing may converge in late 2026 or early 2027 — together will produce the political-institutional environment within which the 2028 succession contest unfolds. Section 13 develops the succession horizon.

12. Three-Account Framings — Legitimacy of the Impeachment, Sara's 2028 Viability, and ICC Sovereignty

The corpus's three-account discipline requires presenting contested framings in parallel without arbitrating which is "primary." This section applies the discipline to three contested questions whose resolution will not be settled within the corpus's reportorial frame.

12.1 Is the impeachment legitimate accountability or political weaponisation?

The Marcos-administration account. The administration framing characterises the impeachment as the operation of constitutional accountability machinery activated by serious public-fiduciary breaches and a public-threat statement. Under this framing, the December 2022 confidential-fund disbursement and its 19-day liquidation pattern represented a constitutionally serious fiduciary breach; the November 2024 "assassin" statement represented a public-conduct violation grossly inconsistent with the constitutional office; and the cumulative pattern documented in the Articles represented grounds for constitutional removal. The administration framing emphasises the Romualdez-led House majority's procedural conduct (the consolidation of complaints, the Committee on Justice report, the 240-signature direct transmittal under Article XI Section 3(4)) as procedurally orderly and constitutionally proper. The framing further emphasises President Marcos's institutional non-interference in the Senate's procedural conduct as evidence of the administration's respect for separation of powers.

The Duterte-camp account. The Duterte-loyalist framing characterises the impeachment as politically engineered persecution by the Romualdez-led House majority and the Marcos camp, designed to prevent Vice-President Duterte from serving as the 2028 presidential succession's frontrunner. Under this framing, the confidential-fund question reflected ordinary executive-branch operations within Joint Circular No. 2015-01's permissible scope and was not a constitutionally serious breach; the November 2024 "assassin" statement was rhetorical and conditional, taken out of context by an administration seeking pretext for impeachment; and the cumulative pattern alleged in the Articles was politically constructed rather than constitutionally grounded. The framing emphasises the Romualdez-Marcos family relationship (the Speaker is the President's first cousin), the parallel ICC arrest of the Vice-President's father, and the broader pattern of administration conduct as evidence of coordinated political persecution. Articulated by Senators Bong Go, Bato Dela Rosa, Imee Marcos, the OVP defence team, Duterte-aligned commentators, and the Hugpong ng Pagbabago and Duterte Youth political vehicles.

The civic-society account. The civic-society framing, articulated by Akbayan, Bayan, the Philippine Center for Investigative Journalism (PCIJ), the Catholic Bishops' Conference of the Philippines through specific bishop statements, the Movement Against Disinformation, and academic critics including Walden Bello and Joel Rocamora, characterises the impeachment as a partial accountability moment that is real in its constitutional grounding but selective in its political application. Under this framing, the confidential-fund question and the November 2024 statement are constitutionally serious and the Articles are properly transmitted; but the broader pattern of the Marcos administration's conduct — including its own Maharlika Investment Fund opacity, the unchecked power of Speaker Romualdez, and the administration's selectivity in which dynasty's conduct attracts accountability scrutiny — undermines the impeachment's claim to systematic accountability. The framing supports the trial's conduct while criticising the broader political context within which it occurs.

12.2 What is Sara Duterte's actual 2028 viability?

The Pulse Asia declining-numbers account. Pulse Asia Research, Inc. survey data across 2024–2026 has tracked declining presidential-preference numbers for Vice-President Duterte: from a 31 per cent plurality in March 2024, when she was the clear front-runner for 2028; to 26 per cent in September 2024; to [TBD-VERIFY: declining trajectory through 2025]; to [TBD-VERIFY: precise 2026 plurality]. The Pulse Asia narrative emphasises the cumulative effect of the confidential-fund controversy, the November 2024 statement, the impeachment, and the ICC arrest of her father on the Vice-President's broader national appeal. Under this framing, the Vice-President's 2028 viability has substantially degraded across 2024–2026 and continues to degrade as the trial proceeds, irrespective of the trial's verdict.

The Duterte-base sustained-loyalty account. The Duterte-camp framing, articulated by camp operators and supported by polling subgroup analyses across Pulse Asia and SWS data, characterises the Vice-President's 2028 viability as anchored to a sustained 25–30 per cent base loyalty unaffected by the trial proceedings. Under this framing, the decline in plurality numbers reflects soft-support attrition that is recoverable in the formal 2028 campaign once the issue salience shifts from the impeachment to substantive policy contestation. The Mindanao political-mobilisation record through 2025–2026, the senatorial-race performance of Senator Bong Go (top vote-getter with approximately 27 million votes in May 2025), and the persistent Duterte-base loyalty across the ICC arrest period together evidence a political-base structure capable of supporting a 2028 candidacy.

The independent political-science account. Academic political-science analysis from Mendoza (2025), Teehankee (2025), Thompson (2025), and Arugay (multiple 2025–2026 Diplomat pieces) characterises the Vice-President's 2028 viability as conditional on three factors whose joint resolution cannot be predicted from mid-2026: the trial verdict (acquittal preserves candidacy; conviction-without-disqualification preserves candidacy with damage; conviction-with-disqualification under Article XI Section 3(7) forecloses candidacy); the broader Duterte-family political fortunes after the ICC proceedings against her father (which condition the family's organisational and resource base); and the alignment of the Marcos camp's own succession strategy (which determines whether the Vice-President faces a coordinated opposition candidacy or a fragmented administration field). Under this framing, the Vice-President's 2028 viability is neither destroyed nor sustained by current trends but is structurally contingent on subsequent events.

12.3 Is the ICC prosecution of Rodrigo a sovereignty violation, an accountability win, or a US-aligned move?

The Duterte-camp sovereignty-violation account. The Duterte-loyalist framing characterises the ICC arrest as a sovereignty violation through an INTERPOL workaround of constitutional limits. Under this framing, the Philippines's 17 March 2019 withdrawal from the Rome Statute terminated ICC jurisdiction over Philippine territory and persons; the operational cooperation with the ICC arrest warrant in March 2025 — even through INTERPOL channels — exceeded the constitutional permissibility of post-withdrawal cooperation; and the Marcos administration's framing of the operation as routine INTERPOL compliance was constitutionally insufficient. The framing further emphasises the political timing of the arrest relative to the impeachment as evidence of political instrumentalisation. Articulated by Duterte-camp counsel, by political vehicles, and by sympathetic commentators including [TBD-VERIFY: specific commentators in the sovereignty-violation framing].

The Karapatan and victims' accountability-win account. The Karapatan-victims and human-rights framing, articulated by Karapatan, Human Rights Watch (through Phelim Kine and Carlos H. Conde statements), drug-war victims' families' organisations, and supportive senators (Hontiveros, Pimentel), characterises the ICC arrest as overdue accountability for the 6,000-plus official drug-war deaths and the 12,000-to-30,000-plus NGO and ICC-estimate figure. Under this framing, the arrest delivers the accountability that domestic Philippine institutions failed to deliver across the 2016–2022 Duterte presidency and the 2022–2025 early Marcos administration period; the sovereignty argument is a procedural distraction from the underlying accountability question; and the trial at The Hague is the institutional venue at which the accountability can be most credibly pursued.

The external-realist US-alignment account. The external-realist framing, articulated by analysts at the Asia Society Policy Institute, the Center for Strategic and International Studies (CSIS) Southeast Asia Program, the Asia Foundation, and academic political scientists working in the Indo-Pacific frame, emphasises the structural alignment of the ICC cooperation with the Marcos administration's broader US-aligned Indo-Pacific posture without arbitrating its merits. Under this framing, the willingness to cooperate with ICC arrest of a former president who had presided over a China tilt and a US-skeptical foreign policy reflects the administration's broader strategic re-orientation toward the US-Japan-Philippines-Australia Squad architecture and the renewed EDCA framework (covered in PH-F-03 and PH-F-05). The framing does not characterise the cooperation as US-directed but as US-aligned in the structural sense — the Marcos administration's strategic posture supplies the political conditions under which ICC cooperation became politically possible.

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13. The 2028 Presidential Succession Horizon — Sara, Imee, Bong Go, and the Marcos Successor Question

The 2028 presidential election is the strategic horizon against which the trial's verdict, the ICC proceedings, and the broader political contestation are calibrated. Under Article VII Section 4 of the 1987 Constitution, the President serves a single six-year term without immediate re-election; Marcos Jr.'s term ends on 30 June 2028. The Vice-President — under normal succession arithmetic — would be the principal succession contender. The trial's verdict will determine whether this normal arithmetic obtains.

Scenario A: Sara Duterte acquitted on all counts, or convicted only on counts not triggering disqualification. Under this scenario, the Vice-President preserves her constitutional eligibility for the presidency and emerges from the trial with substantial political capital from successful defence. The Duterte camp's 2028 candidacy is then anchored on the Vice-President. Polling trajectories will determine the campaign's specific dynamics, but the institutional base — Hugpong ng Pagbabago in Mindanao, the Bong Go and Bato Dela Rosa Senate-based political infrastructure, the Duterte Youth and allied formations — supports a viable nationwide campaign. The administration response would likely involve consolidating around an alternative candidate; the possibilities are developed below.

Scenario B: Sara Duterte convicted on at least one count triggering disqualification under Article XI Section 3(7). Under this scenario, the Vice-President is removed from office and disqualified from holding any future office of public trust, foreclosing her 2028 candidacy. The Duterte camp's 2028 candidacy is then concentrated on Senator Bong Go (drawing on his 2025 record-breaking senatorial vote total and his close personal association with Rodrigo Duterte), with Senator Bato Dela Rosa as a secondary possibility and former Davao City Mayor Sebastian "Baste" Duterte (Rodrigo's youngest son) as a longer-shot family-restoration candidate. The Vice-President herself, though disqualified from office, may continue as a campaign-supporter figure for the camp's alternative candidate, retaining political influence even if barred from elected office.

Scenario C: The Marcos camp's chosen successor. The Marcos camp's 2028 candidate field is, as of mid-2026, unresolved. The principal candidate possibilities discussed in 2025–2026 commentary include Speaker Martin G. Romualdez (the President's first cousin and Lakas-CMD chair, with substantial House-based organisational resources but with potential public-perception costs from the perceived family-consolidation pattern); Senator Erwin Tulfo (newly elected 2025 with substantial vote share, drawing on Tulfo-family media base, but with relatively limited national political experience); Senator Joel Villanueva (the administration's principal senatorial operator, with substantial institutional credentials but with comparatively limited mass-political appeal); Secretary of Finance Ralph Recto (drawing on his Recto-family political tradition and his fiscal-policy credentials); and the President's brother-in-law and senatorial allies in shifting combinations. The Marcos camp's eventual candidate selection will depend on the trial verdict (affecting whether the contest is against an active Sara candidacy), the ICC trial trajectory, and the 2027 internal political dynamics within the administration coalition.

Scenario D: Imee R. Marcos as a Marcos-family alternative. Senator Imee R. Marcos's May 2025 re-election with Duterte-camp endorsement, despite her being the President's elder sister, supplies a candidacy possibility that crosses the standard factional lines. Under this scenario, if Sara Duterte is disqualified and if the Marcos administration's preferred successor fails to consolidate, Imee Marcos as a Marcos-family alternative who has broken with the administration line on the impeachment supplies a candidate with substantial dynastic credentials and demonstrated cross-faction appeal. Imee's 2028 candidacy is, as of mid-2026, neither confirmed nor excluded; her public statements through 2025–2026 have been carefully ambiguous on the question.

Scenario E: An opposition reformist candidate. The opposition liberal-progressive bloc — anchored on Senators Hontiveros, Pangilinan (until June 2025), Pimentel, and on the broader civil-society-Akbayan coalition — has not, as of mid-2026, consolidated around a 2028 candidate. The principal possibilities include Senator Hontiveros herself (with substantial reformist credentials but historically limited national vote-share), former Vice-President Leni Robredo (whose 2022 loss left her in a political-strategic position that her post-2022 essay collections and civic-society work have left ambiguous regarding 2028 candidacy), and emerging reform-faction figures whose public profile would need to be established in the 2026–2027 period. The opposition candidacy's structural challenges — fragmentation, resource constraints, and the difficulty of competing against the dynastic political machinery — make Scenario E a low-probability outcome under current conditions.

Scenario F: A senator-judge breakout candidate. The Senate trial itself supplies the political-stage for several senator-judges whose conduct during the trial could position them for 2028 candidacy. Senators Zubiri, Gatchalian, Hontiveros, and Pimentel have been variously discussed in 2025–2026 commentary as potential candidates whose trial conduct could supply the credentials for a candidacy. The scenario's probability depends on whether the senator-judges' conduct during the trial generates the public profile necessary for a national campaign and whether they can build the cross-factional coalition necessary to win.

The interaction across these scenarios is complex. The trial verdict's content (full acquittal versus partial conviction versus full conviction) supplies the principal input; the ICC trial outcome supplies a secondary input affecting the broader Duterte-family political viability; and the 2027 internal political dynamics within both the administration coalition and the Duterte camp supply the structural environment within which the 2028 candidate selection occurs.

What is clear, as of mid-2026, is that the 2028 succession will be structurally conditioned by the trial outcome in a way no prior Philippine presidential succession has been conditioned by an antecedent constitutional accountability proceeding. The 1992 succession from Cory Aquino to Fidel Ramos was not so conditioned; the 1998 succession from Ramos to Estrada was not so conditioned; the post-2001 successions from Arroyo and onward operated within their own political contexts. The 2028 succession will be the first post-EDSA presidential succession whose terms are substantially set by an active impeachment trial of the incumbent Vice-President.

14. Conclusion and Spiral Index — Outstanding Questions Through 2028

The Sara Duterte impeachment trial is, as of this document's last update on 22 May 2026, an unresolved constitutional and political process whose verdict will not be rendered for some additional months. The corpus does not predict the verdict. What the corpus can document — and has documented in this anchor — is the institutional architecture within which the verdict will be reached, the procedural sequence that ran from the 5 February 2025 House transmittal through the procedural crisis, the 25 July 2025 Supreme Court ruling that voided the first articles, and the 2026 re-impeachment that brought new articles to the Senate, and the contested framings within which the verdict's political meaning will be received.

Three structural observations close this anchor.

First, the trial is a test of the post-EDSA constitutional settlement's resilience under conditions of dynastic conflict. The 1987 Constitution was drafted by the Constitutional Commission in 1986–1987 against the immediate memory of the Marcos martial-law period and the EDSA Revolution. The impeachment provisions of Article XI were designed to provide a constitutional mechanism for accountability of high officials that would be politically credible while procedurally rigorous. The Sara Duterte trial — proceeding under conditions of conflict between the dynasties whose 2022 UniTeam alliance had been the most arithmetically dominant in post-EDSA history — tests whether the constitutional architecture can produce a politically credible accountability outcome when the political alignments cut directly across the post-EDSA institutional consensus. The 2012 Corona impeachment had tested the framework under different conditions (a Chief Justice rather than a Vice-President; an Aquino administration rather than a Marcos administration; a less polarised political environment). The Sara Duterte trial extends and deepens the test.

Second, the trial's evidentiary architecture is unusually well-documented for a Philippine constitutional accountability proceeding. The COA audit reports, the House Quad Committee transcripts, the Senate Sub-Committee record, the Supreme Court litigation filings, the impeachment-court records of both the 2025 and 2026 proceedings, the public statements of the principal participants, the contemporaneous reporting by Rappler, the Inquirer, the Star, PCIJ, and other outlets, and the academic and policy literature produced through 2025–2026 by Curato, Mendoza, Teehankee, Thompson, Arugay, Coronel, and others, together constitute one of the most extensively documented Philippine political-constitutional processes since the EDSA Revolution. Future research waves will close TBD-VERIFY tags in this document as the primary record becomes more fully accessible; the structural shape of the documentation is, by mid-2026, already established.

Third, the trial's verdict will shape but not determine the 2028 succession. The succession's complex contingencies — across the trial verdict, the ICC trial outcome, the 2027 internal coalition dynamics, the broader economic and foreign-policy environment, and the emergence of candidates in scenarios A through F outlined in Section 13 — together produce a political environment within which the verdict is a significant input but not the only input. The corpus's tracking of the 2028 succession will be the subject of subsequent block-D and block-E documents whose codes will be assigned as the configuration of the contest clarifies; this anchor establishes the foundational architecture within which those later documents will operate.

Spiral Index — Outstanding Questions Through 2028

The following questions remain unresolved as of mid-2026 and will be the principal analytical targets of subsequent research waves:

1. The trial verdict. Conviction on which counts, if any? With what senator-judge alignment? On what evidentiary grounds the senator-judges articulate in their explanatory statements? With what dissenting positions?

2. The disqualification consequence. If conviction occurs on any count, does it trigger disqualification under Article XI Section 3(7)? Is the disqualification challenged by the Vice-President in subsequent Supreme Court litigation? Is it sustained?

3. The procedural precedents. What procedural innovations and precedents does the trial establish for future Philippine impeachment proceedings? How do the trial's evidentiary rulings interact with the Corona impeachment record? How does the Supreme Court's 25 July 2025 ruling on the one-year bar and due process operate in subsequent cases?

4. The ICC trial outcome. What does the ICC trial of Rodrigo Duterte produce — conviction, acquittal, partial conviction? With what implications for the broader Duterte-family political fortunes? With what consequences for Philippine relations with the international criminal-justice regime?

5. The 2028 succession. Which scenario (A through F) materialises? With what candidacy alignments and platform commitments? With what relationship to the 2025–2026 political record established by the trial?

6. The Marcos administration's legacy. How is the Marcos Jr. administration's 2022–2028 record evaluated retrospectively, particularly on the questions of constitutional accountability, ICC cooperation, foreign-policy realignment, and the Maharlika Investment Fund's operational record? With what historiographical positioning between the Duterte-era and the Aquino-era reference frames?

7. The post-2028 institutional environment. What does the Philippine political-institutional environment look like after the 2028 transition? Does the impeachment process establish a more robust accountability mechanism, or does it reinforce the dynamic of selective dynastic accountability? Does the ICC cooperation framework persist under a successor administration, or is it reversed?

8. The constitutional historiography. How is the 2024–2026 sequence — the rupture, the impeachment, the ICC arrest, the trial — positioned in the broader constitutional history of the 1987 Republic? Does it constitute an "EDSA moment" of constitutional renewal, a moment of dynastic factionalism dressed as constitutional process, or a structural inflection between the post-EDSA settlement and a successor political order whose shape is not yet evident?

These questions will be addressed in successive research waves through 2026–2028. The present document establishes the foundational record from which those subsequent inquiries can proceed.

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Document end. PH-D-06 is read as a triangulated anchor with PH-D-04 (institutional mechanics of the rupture), PH-D-05 (electoral-axis treatment of the same sequence), and PH-D-02 (the war on drugs and ICC investigation supplying the parallel-process context). Cross-references from PH-D-06 to those documents are reciprocal and load-bearing; corpus consumers should expect to read all four documents together for the fullest treatment of the 2024–2026 Philippine constitutional and political sequence.

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27. Bello, Walden. "The Trial of the Vice-President." Foreign Policy in Focus and follow-on essays, 2025.
28. Rocamora, Joel. Commentary essays in Inquirer.net and Rappler on the post-rupture political order, 2024–2026.
29. Philippine Daily Inquirer, Inquirer.net, Philippine Star, Manila Bulletin, Rappler, Vera Files, CNN Philippines, ABS-CBN News, GMA News, BusinessMirror, Reuters Manila, Bloomberg Asia — sustained 2024–2026 coverage of the impeachment proceedings, the ICC arrest, the mid-terms, and the Senate trial.
30. Human Rights Watch (Phelim Kine and Carlos H. Conde). World Report 2025: Philippines and World Report 2026: Philippines country chapters; and statements on the impeachment and ICC proceedings, 2025–2026.
31. Al Jazeera. "Philippine Vice President Duterte's impeachment trial begins: What we know," 6 July 2026; Courthouse News Service, "Philippine Senate opens the impeachment trial of Vice President Sara Duterte," July 2026. [Search-retrieved 2026-08-29; not independently fetch-verified in this session.]
32. GMA News Online. "LIVE UPDATES: Sara Duterte Impeachment Trial" series, editions of 3, 4, 11, 12, and 24 August 2026. [Search-retrieved 2026-08-29; not independently fetch-verified in this session.]
33. Philippine Daily Inquirer / Inquirer.net. "WATCH: Sara Duterte impeachment trial" series, editions of 3, 25, and 26 August 2026, including witness-testimony coverage of Xylene del Campo, Roderick Wamil, Gina Acosta, and Lemuel Ortonio. [Search-retrieved 2026-08-29; not independently fetch-verified in this session.]

Related Documents

• PH-H-PRES-04: Rodrigo Roa Duterte (1945–)
• PH-H-PRES-03: Ferdinand Romualdez Marcos Jr. — "Bongbong" (1957–)
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• PH-B-05: EDSA Revolution (22–25 February 1986) — the post-1986 constitutional settlement that defines impeachment, the two-thirds Senate conviction threshold, and the Vice-Presidential office
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• PH-D-01: Noynoy Aquino's Presidency (2010–2016) — the 2012 Corona impeachment and conviction, the immediate procedural precedent for the 2025–2026 trial
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• PH-I-01: The Philippine Supreme Court and Judicial Politics
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