Sara Duterte impeachment trial opens as Philippines’ 2028 election hangs in balance

The Philippine Senate will convene as an impeachment court on July 6, 2026, to begin the trial of Vice President Sara Duterte, opening a politically charged process that could remove one of the country’s most influential leaders and reshape the 2028 presidential election.

Sara Duterte faces allegations involving the misuse of confidential government funds, unexplained wealth, bribery, graft and threats against President Ferdinand Marcos Jr., First Lady Liza Araneta Marcos and former House Speaker Martin Romualdez. Sara Duterte denies wrongdoing and maintains that the impeachment campaign is politically motivated.

More than 6,000 police officers, including public-order and anti-riot units, have been deployed around the Senate complex as supporters and opponents of Sara Duterte prepare to demonstrate. A working pretrial plan sets aside as many as 92 days for proceedings, although disputes over evidence, witnesses and procedure could alter the timetable.

The trial is the first full impeachment trial of a Philippine vice president and comes four years after Ferdinand Marcos Jr. and Sara Duterte won office together under a campaign built around political unity. Their alliance has since collapsed into an open struggle between two of the Philippines’ most powerful dynasties.

What will happen when the Philippine Senate opens Sara Duterte’s impeachment trial?

The 24 senators will sit as judges rather than ordinary legislators, with Senate President Sherwin Gatchalian expected to preside over the impeachment court. Senators are required to take an oath to decide the case impartially, receive evidence from House prosecutors and hear the defence presented by Sara Duterte’s legal team.

Sara Duterte may attend personally or allow her lawyers to represent her during the initial proceedings. Her legal team has indicated that it is prepared to challenge the accusations and demonstrate that the articles of impeachment lack a sufficient factual basis.

The opening phase is expected to address procedural matters, including the presentation of the prosecution and defence teams, trial rules, witness arrangements, documentary evidence and the order in which the articles will be considered. These questions could determine whether the trial proceeds efficiently or becomes delayed by repeated objections.

The House of Representatives acts as the prosecution because it approved the articles of impeachment and transmitted them to the Senate. The House voted 257 to 25, with nine abstentions, to impeach Sara Duterte on May 11, comfortably exceeding the constitutional threshold needed to send the case to trial.

Conviction requires the support of two-thirds of the entire Senate, meaning at least 16 of the 24 senators must vote against Sara Duterte. A simple majority is insufficient, giving the vice president’s allies substantial influence even if the prosecution persuades more senators than the defence.

What allegations involving confidential funds and unexplained wealth will prosecutors present?

One of the central articles concerns the alleged misuse and questionable liquidation of 612.5 million Philippine pesos in confidential funds allocated during Sara Duterte’s service as vice president and education secretary.

Confidential funds are intended for sensitive activities where ordinary public disclosure could compromise security or intelligence work. The prosecution is expected to argue that the documents used to account for portions of the spending were unreliable, incomplete or inconsistent with lawful public-finance requirements.

The defence is likely to challenge the interpretation of the records, the credibility of witnesses and whether the spending decisions rise to the constitutional level required for removal from office. An impeachment trial is not identical to a criminal prosecution, but the allegations must still be supported by evidence strong enough to persuade at least 16 senator-judges.

A separate article concerns alleged unexplained wealth and possible omissions from Sara Duterte’s Statements of Assets, Liabilities and Net Worth. Public officials in the Philippines are required to disclose their assets and financial interests, making the accuracy of those declarations central to the prosecution’s case.

Other allegations include bribery, graft and conduct described by the House as threatening constitutional government. The prosecution will need to demonstrate how each accusation fits recognised grounds for impeachment, including culpable violation of the Constitution, bribery, graft and corruption, other high crimes or betrayal of public trust.

Sara Duterte has rejected the accusations in general terms and has described the proceeding as an effort by political opponents to eliminate her before the next presidential election. The trial will provide the first sustained forum in which her lawyers must answer the evidence article by article.

Why are Sara Duterte’s alleged threats against Ferdinand Marcos Jr. part of the case?

The impeachment articles include statements made by Sara Duterte during her escalating conflict with the Marcos administration. Sara Duterte said in 2024 that she had arranged for Ferdinand Marcos Jr., Liza Araneta Marcos and Martin Romualdez to be killed if she herself were assassinated.

Sara Duterte later argued that the comments had been taken out of context and did not constitute an active assassination plan. Prosecutors contend that such statements by the sitting vice president represented an unacceptable threat against senior constitutional officials and demonstrated conduct incompatible with public office.

The Senate will have to determine whether the remarks were political rhetoric, a conditional expression of anger or evidence of a genuine threat. The legal and constitutional significance will depend on the words used, the circumstances surrounding them and any supporting evidence presented by investigators.

The allegations carry unusual weight because the vice president is first in the constitutional line of succession. Statements involving the potential killing of the president therefore raise concerns that extend beyond an ordinary dispute between rival politicians.

The prosecution may argue that the comments form part of a wider pattern of destabilising conduct. The defence can respond that impeachment cannot be based on political interpretation alone and that strong language does not automatically establish an impeachable offence.

How did the Marcos and Duterte alliance collapse into an impeachment confrontation?

Ferdinand Marcos Jr. and Sara Duterte ran together in the 2022 election under a unity campaign that combined the political organisations, geographic strongholds and family names of two dominant dynasties.

The arrangement began deteriorating after the election as disagreements emerged over policy, appointments, public spending and political succession. Sara Duterte resigned as education secretary in 2024 but remained vice president, creating a situation in which the country’s two highest elected officials served in the same administration while increasingly operating as adversaries.

The conflict deepened after former President Rodrigo Duterte was arrested in 2025 and transferred to International Criminal Court custody in The Hague. Rodrigo Duterte is awaiting trial over alleged crimes against humanity connected with killings during his anti-drug campaign.

Sara Duterte has blamed the Marcos administration for permitting the arrest and transfer of her father. The Marcos government has maintained that Philippine authorities followed applicable international and domestic procedures.

Foreign-policy differences have added to the division. Ferdinand Marcos Jr. has strengthened defence cooperation with the United States and adopted a more confrontational position towards Chinese actions in the South China Sea. Rodrigo Duterte had pursued closer relations with China and Russia while distancing the Philippines from Washington.

The impeachment trial has consequently become part of a wider contest over the direction of the Philippines after Ferdinand Marcos Jr. leaves office. The Philippine Constitution limits the president to one six-year term, ensuring that the 2028 succession race will take place without an incumbent seeking re-election.

Could the divided Philippine Senate produce the 16 votes needed to convict Sara Duterte?

Reaching 16 votes will be difficult because the Senate is divided among Duterte loyalists, Marcos-aligned politicians, independent figures and legislators whose positions may shift according to the evidence and public reaction.

The chamber has experienced severe leadership turmoil in the weeks preceding the trial. Alan Peter Cayetano, a longtime ally of the Duterte family, became Senate president in May before a rival group later assembled enough votes to replace him with Sherwin Gatchalian.

Those leadership contests revealed the strength of competing factions but do not provide a reliable forecast of the final impeachment vote. Supporting a Senate president is a political calculation, while voting to remove an elected vice president carries different constitutional and electoral consequences.

Senators considering future presidential, vice-presidential or national campaigns must also assess how their decisions will be viewed by supporters of the Marcos and Duterte families. A vote seen as partisan could strengthen one political camp while damaging the credibility of the senator and the institution.

The prosecution must therefore do more than prove that the House had political support for impeachment. It must build a case capable of moving senators beyond factional loyalty and towards the supermajority required for conviction.

The defence does not necessarily need to establish that every allegation is false. Preventing the prosecution from reaching 16 votes would result in acquittal, making uncertainty, procedural objections and divisions among senators strategically important.

Why will public confidence in the fairness of the impeachment process matter so much?

The constitutional legitimacy of the verdict will depend not only on the numerical vote but also on whether Filipinos believe both sides received a genuine opportunity to present evidence and challenge opposing claims.

Philippine history provides a warning about impeachment procedures that become identified with partisan manipulation. The 2000 to 2001 trial of President Joseph Estrada collapsed after senators voted against opening an envelope believed to contain important evidence. The decision triggered mass protests and contributed to Joseph Estrada’s removal from power.

The 2012 impeachment of Chief Justice Renato Corona followed a different path. The Senate conducted a trial lasting approximately four months before voting to convict and remove Renato Corona over failures involving asset disclosures.

Sara Duterte’s previous impeachment also illustrates the importance of procedure. The Supreme Court invalidated the 2025 case after finding that the House process violated the constitutional restriction against initiating more than one impeachment proceeding against the same official within a year. The Supreme Court also emphasised that due process and fairness apply during impeachment proceedings.

The 2026 House process was structured after the expiration of the constitutional bar and included committee stages covering form, substance, grounds and probable cause before the plenary vote. The Senate must now ensure that the trial does not reproduce the procedural weaknesses that defeated the earlier case.

A transparent trial could strengthen institutional confidence regardless of the outcome. A proceeding perceived as rushed, selective or politically predetermined could deepen divisions and leave the legitimacy of the verdict contested.

How could conviction or acquittal reshape the Philippines’ 2028 presidential election?

Sara Duterte has announced her intention to seek the presidency in 2028 and has remained one of the strongest potential candidates in national opinion polling.

A conviction would remove Sara Duterte from the vice presidency. The Senate could also disqualify her from holding future public office, which would prevent her from contesting the 2028 presidential election.

The Philippine Constitution limits impeachment punishment to removal and disqualification from public office, but conviction would not prevent separate criminal or civil proceedings. A former official can remain subject to prosecution, trial and punishment under ordinary law.

Removing Sara Duterte would force the Duterte political organisation to decide whether another family member or allied candidate could inherit her support. It would also change the calculations of the Marcos camp, which must identify a presidential candidate capable of defeating both Duterte-aligned and opposition contenders.

An acquittal could strengthen Sara Duterte’s claim that the impeachment was an unsuccessful political attack. She could enter the 2028 campaign arguing that senators had rejected allegations promoted by a House dominated by the allies of Ferdinand Marcos Jr.

Acquittal would not automatically resolve concerns about confidential funds, wealth declarations or the threats attributed to her. The evidence and testimony disclosed during the trial may continue shaping public opinion even without the 16 votes needed for removal.

The most damaging outcome for Philippine institutions could be a verdict that neither side accepts as legitimate. Conviction without broad public confidence could deepen claims of persecution, while acquittal after an apparently incomplete trial could reinforce perceptions that powerful political families remain beyond accountability.

What are the key takeaways from Sara Duterte’s Philippine Senate impeachment trial?

• The Philippine Senate will open the impeachment trial of Vice President Sara Duterte on July 6, 2026, beginning the first full Senate trial of a vice president in the country’s constitutional history.
• The House of Representatives voted 257 to 25, with nine abstentions, to impeach Sara Duterte over allegations involving confidential funds, unexplained wealth, bribery, graft and threats against senior political officials.
• Prosecutors allege that Sara Duterte misused or improperly accounted for 612.5 million Philippine pesos in confidential funds allocated during her service as vice president and education secretary.
• Sara Duterte denies wrongdoing and maintains that the proceedings are politically motivated, while her defence team is expected to challenge the evidence, the constitutional grounds and the credibility of the prosecution’s case.
• Conviction requires at least 16 votes in the 24-member Senate, meaning the prosecution must secure a two-thirds supermajority rather than an ordinary majority of senators participating in the trial.
• A conviction would remove Sara Duterte from office and could disqualify her from seeking public office again, potentially ending her announced campaign for the Philippine presidency in 2028.
• The proceeding follows the Supreme Court’s invalidation of a previous impeachment case in 2025, increasing pressure on the House and Senate to observe constitutional due process and provide both sides with a fair hearing.
• The verdict will affect more than Sara Duterte’s personal future because it could reshape the presidential succession contest, redefine the Marcos-Duterte rivalry and influence public confidence in Philippine democratic institutions.