The Dutertes vs. the Marcoses: Inside the impeachment trial that will redraw Philippine politics

At 09:00 UTC on Monday, 6 July 2026, the Philippine Senate is set to open the impeachment trial of Vice President Sara Duterte, the daughter of former president Rodrigo Duterte and the sitting second-in-command of the republic. The proceeding is unusual in almost every respect: it targets a sitting vice president; it unfolds roughly two years before the 2028 presidential election that Sara Duterte herself has signalled she intends to contest; and it pits her family — the Dutertes, whose six-year hold on Malacañang reshaped Manila's drug war, its foreign policy tilt toward Beijing, and its posture toward the International Criminal Court — against the family that helped dislodge them, the Marcoses, who now occupy both the presidency and the speakership of the House of Representatives.

What begins in the upper chamber this week is, in substance, the first formal round of the 2028 race. Every vote that senators cast on the articles of impeachment will be read in the provinces as a declaration of factional allegiance. Every motion, every recess, every televised exchange between prosecutors and defence counsel will be cut into campaign footage long before the trial concludes. The legal merits — including the constitutional question of whether the articles were transmitted in proper form — will be argued in court; the political merits will be argued everywhere else.

A constitutional collision, not a legal curiosity

The articles of impeachment against Sara Duterte were transmitted by the House of Representatives earlier in 2026 and centre on allegations that she conspired to assassinate President Ferdinand Marcos Jr., along with other public figures, and on questions around her use of confidential funds during her tenure as secretary of the interior. Reuters and Nikkei Asia, the two wire sources closest to the procedural record, frame the trial as a constitutional test of the impeachment mechanism itself, not merely a verdict on one vice president.

Under the 1987 Constitution, an impeachable officer is tried by the Senate with the chief justice presiding. A two-thirds vote of the sitting senators is required to convict and remove. The Senate's composition — currently tilted, after the 2025 mid-terms, toward a coalition that includes allies of the Marcos administration — is what gives the proceedings their political weight. A conviction would bar Sara Duterte from any future office, including the presidency. Acquittal, by contrast, would vindicate her claim that the process is a politically motivated manoeuvre and would, by the same logic, clear the path for a 2028 run.

That binary is what makes the trial combustible. It is not a preliminary hearing that can be deferred without consequence; it is the moment at which the Duterte coalition either absorbs a disqualifying blow or survives it with a renewed mandate. There is no procedural middle ground that leaves both families standing.

The dynastic argument

The Philippine republic was constructed, in significant part, as a repudiation of the Marcos dynasty. The 1986 People Power Revolution ended the twenty-year rule of Ferdinand Marcos Sr. and installed Corazon Aquino, whose family name has since become shorthand for the anti-dictatorship tradition. The Marcoses' return to Malacañang — through the 2022 presidential victory of Ferdinand Marcos Jr., a son of the ousted dictator — was already, by 2022, a rupture with that historical settlement.

The Dutertes emerged, in turn, as the dominant counter-elite. Rodrigo Duterte's 2016 win on a populist anti-crime platform, his subsequent cultivation of Beijing and his estrangement from the United States, and his cultivation of a national-provincial machine rooted in Davao City made him, by 2022, the central obstacle to a smooth Marcos restoration. He endorsed Sara as his successor; the Marcos-Duterte alliance carried Bongbong Marcos to the presidency; and Sara won the vice presidency on a separate ticket, an arrangement that almost immediately began to fray.

The impeachment, in that sense, is not the cause of the split between the two families. It is the legal-formal expression of a split that began the day after the 2022 election returns were certified. The trial that opens on 6 July will be conducted under the rules of evidence and the standing orders of the Senate, but the political logic animating it is dynastic succession.

The ICC question and the China question, sitting underneath

Two structural pressures run underneath the procedural record and are likely to surface, directly or by implication, during the trial.

The first is the International Criminal Court. Rodrigo Duterte is the subject of an ICC investigation into the conduct of his anti-drug campaign, in which thousands of Filipinos were killed in police operations and by vigilantes. The Marcos administration has so far declined to cooperate fully with The Hague, and the question of whether a Sara Duterte presidency would, or would not, continue that refusal is not abstract. It is one of the few issues on which the two factions diverge sharply in public.

The second is China. The Duterte presidency oversaw a marked reorientation of Philippine foreign policy toward Beijing, including joint exploration arrangements in the South China Sea that were reversed by Marcos Jr. after 2022. The current administration has rebuilt ties with Washington, expanded access arrangements at Philippine bases, and contested Chinese incursions around the Second Thomas Shoal with a regularity the previous administration avoided. A return of the Dutertes to Malacañang would, on the public record of both Rodrigo and Sara, reopen the question of which axis Manila tilts along. Foreign-policy alignment is not among the articles of impeachment. It is, nonetheless, one of the stakes every voter in 2028 will read off the verdict.

Counter-read: a constitutional safeguard, not a coup

The framing the Marcos-aligned House majority and much of the Manila-based English-language press have adopted is that impeachment is functioning as designed: an evidence-based mechanism for holding senior officers accountable, triggered by credible allegations, and now routed through the only body constitutionally empowered to adjudicate it. On this reading, the trial is a vindication of the system — proof that no family, however powerful, sits above the 1987 framework.

The counter-read, articulated most pointedly by Duterte-aligned commentators and a portion of the Philippine legal commentariat, is that the articles were transmitted with procedural defects; that the case rests in part on a self-serving complaint from a Marcos-linked witness; and that the timing — two years before a presidential election the vice president is widely expected to enter — is itself the tell. On this reading, the trial is the constitutional mechanism weaponised. It produces accountability in form while functioning, in substance, as a dynastic manoeuvre.

Both readings are partially correct, and the trial will not resolve which is more so. What can be said is that impeachment in this republic has always been intensely political: Joseph Estrada was removed in 2001 by a procedure that began as a trial and ended as a street mobilisation; the articles against Chief Justice Renato Corona in 2012 turned on questions that were as much about the Aquino government's relationship with the Supreme Court as about the underlying evidence. The Senate, in other words, has prior experience with proceedings in which the constitutional form and the factional substance are difficult to disentangle.

What is genuinely contested, and what is not

Three things are not in serious dispute. The House did transmit articles of impeachment. The Senate is constitutionally required to convene a trial. And the vice president is, as a matter of law, an impeachable officer.

What is contested is whether the specific articles meet the standard for conviction — particularly the allegation that Sara Duterte plotted the assassination of the sitting president, which is an extraordinary charge and which, if proved, would constitute an offence against the state itself. The Senate's presiding officer, the chief justice, will rule on procedural questions; the senator-judges will weigh the evidence; and the public will weigh the senators.

What is also contested, and largely absent from the wire coverage, is the question of what a Duterte restoration would mean in policy terms. Reuters and Nikkei Asia report the procedural choreography; neither has published, in the material available to this article, an extended treatment of the foreign-policy and ICC-related implications of a possible acquittal and a 2028 Duterte candidacy. That omission is itself a marker of how Manila-centred the present framing is.

Stakes, over three time horizons

In the immediate term, the trial will consume the legislative calendar. Confirmation of the executive's budget, pending franchise bills, and treaty-related legislation will compete with daily trial sessions for floor time. The administration's coalition management will be tested weekly.

Over the medium term — through to the 2028 polls — the verdict will function as the de facto opening of the presidential campaign. An acquittal restores Sara Duterte as the presumptive opposition standard-bearer; a conviction removes her from the field entirely and forces the Duterte coalition to recalibrate around a less nationally recognisable figure. The Marcos family, in either scenario, retains the institutional advantages of incumbency.

Over the longer term, the trial will be read as a precedent. If the Senate removes a vice president on the strength of the present articles, the bar for future impeachments will have been measurably lowered. If it acquits, the political use of the mechanism will be debated, again, as it was after Estrada and Corona. Either outcome will be cited, in 2028 and after, by whichever side finds itself on the receiving end of the next impeachment.

The Philippines is not, on the available evidence, sliding toward institutional collapse. The courts are functioning, the Senate is convening, the press is reporting. What is being stress-tested is something narrower and more specific: whether the constitutional mechanism designed in 1987 to prevent the consolidation of dynastic power can be deployed, in 2026, against a dynasty that did not exist when the constitution was written. The answer will not be legal. It will be electoral, and it will arrive in May 2028.

— This article was framed as a constitutional-procedural story rather than a personality-driven one, with attention to the dynastic logic the wire coverage largely leaves implicit.

Wire provenance

This editorial synthesis draws on the following public wire/social posts:

• https://t.me/reuters/2073934879063171073
• https://t.me/NikkeiAsia/2073934879063171073
• https://t.me/nikkeiasia/2073934879063171073
• https://en.wikipedia.org/wiki/Impeachment_in_the_Philippines
• https://en.wikipedia.org/wiki/Sara_Duterte
• https://en.wikipedia.org/wiki/2028_Philippine_presidential_election
• https://en.wikipedia.org/wiki/Ferdinand_Marcos_Jr.
• https://en.wikipedia.org/wiki/Rodrigo_Duterte