Constitutional Quagmire: Vice President Duterte’s Impeachment Trial Ignites Presiding Officer Debate

Constitutional Quagmire: Vice President Duterte’s Impeachment Trial Ignites Presiding Officer Debate

By Bing Jabadan – TheNATIONWEEK.com | July 7, 2026

MANILA, Philippines – The Philippines’ legal landscape is gripped by an unprecedented constitutional crisis as the impeachment trial of Vice President Sara Duterte, the first ever for a sitting vice president, began on July 6, 2026. 

While the nation watches for revelations regarding allegations of misused funds, unexplained wealth, and betrayal of public trust, the legitimacy of the proceedings is being fiercely debated. 

At the heart of this controversy is the role of the Senate President in presiding over such a monumental trial, particularly given the current Senate President Sherwin Gatchalian’s non-legal background.

Though Senator Francis “Chiz” Escudero was elected to preside, securing 12-8 votes, a powerful constitutional argument has been made, contending that the Senate President is the constitutionally designated presiding officer for impeachment trials not involving the President. This divergence has cast doubt on the legal grounding and procedural integrity of the entire process.

The trial, projected to last 92 days, will scrutinize four Articles of Impeachment against Vice President Duterte. These articles detail allegations of P612.5 million in confidential fund misuse, unexplained wealth, constitutional violations, and a profound betrayal of public trust. 

Senator Escudero, familiar with the role from archived 2025 impeachment proceedings against Duterte, promptly established a conviction threshold of 16 votes from the senator-judges, accounting for three recused senators.

Vice President Duterte was conspicuously absent from the opening session. Her legal counsel, Michael Poa, confirmed her representation by lawyers, asserting this “does not diminish accountability or imply a lack of transparency.” 

Duterte publicly dismissed President Ferdinand Marcos Jr.’s suggestion for her personal appearance, stating his opinion was “of no importance” and emphasizing adherence to constitutional guidance.

The initial legal skirmish saw an early victory for the defense. Lead public prosecutor, Batangas Rep. Gerville Luistro, moved for Duterte’s arraignment under Rule No. 7 of the Senate impeachment rules, a provision applicable when a respondent fails to appear or respond. However, the Senate impeachment court decisively rejected this motion, rebuffing the prosecution’s contention that a formal reading of the four Articles of Impeachment and a plea entry were imperative on Day 1.

The prosecution affirmed its intent to pursue the trial regardless of a potential resignation by Vice President Duterte. Spokesperson Benjamin Tolosa Jr. underscored that conviction carries dual penalties: removal from office and perpetual disqualification from holding public office. Resignation, he clarified, would only address the former.

Security measures were exceptionally stringent throughout the proceedings, with the Philippine National Police deploying 3,250 officers to the Senate premises and an additional 2,900 on standby, underscoring the high stakes and national significance of this unprecedented trial.

The Constitutional Mandate: A Legal Battle Over the Gavel

The debate over the presiding officer’s legitimacy reached a critical juncture with Senator Alan Peter Cayetano’s compelling point of order. He forcefully argued for the imperative of upholding the Constitution’s clear designation of the Senate President as the presiding officer of the impeachment court in cases not involving the President.

“Even if a substitute presiding officer acts fairly,” Cayetano warned, “a conviction or acquittal reached under a constitutionally defective process would invite immediate judicial challenge and cast doubt on the validity of the entire trial.” 

He emphasized that the authority to preside must stem directly from the Constitution or governing law, not merely from a tribunal’s vote. Proceedings conducted by a decision-maker lacking this inherent legal authority, he cautioned, could be declared void regardless of the perceived fairness of the trial.

Cayetano specifically referenced Article XI, Section 3 of the 1987 Constitution. While it explicitly states the Chief Justice presides when the President is the respondent, he highlighted that the framers of the Constitutional Commission clearly intended for the Senate President to preside in all other impeachment proceedings. 

He cited precise deliberations from the 1986 Constitutional Commission, including a pivotal exchange with former Chief Justice Hilario Davide Jr., where an amendment explicitly stating the Senate President shall preside was withdrawn because commissioners widely agreed such authority was already implicitly understood.

“The spirit of the Constitution is that it is the Senate President who will preside,” Cayetano affirmed, highlighting the framers’ deliberate recognition of the Senate President’s role, particularly due to the position being elected by a majority of senators, reflecting the will of the body. He further noted that Senate Rules require amendments to be presented a day before a session, a procedural step he asserted was not followed prior to the supposed “rump session” on June 3 where the rule changes were purportedly agreed upon.

Conversely, Senator Francis “Kiko” Pangilinan defended the Senate’s authority to elect its presiding officer, asserting that the Constitution grants Congress the power to promulgate its own rules. Pangilinan stated that the Senate exercised this rule-making authority by approving amendments to the impeachment rules on June 3, later unanimously ratified on June 17, thus carrying a presumption of regularity. 

He contended that the Constitution explicitly names the Chief Justice to preside only when the President is on trial, and “Nowhere in the Constitution…does it say that the Senate President must preside when the Vice President is under trial or any other impeachable officer.”

Despite these counterarguments, the central contention regarding the foundational constitutional principle and the weighty historical precedent for the Senate President’s inherent role in presiding over impeachment trials remains unresolved. 

The election of an alternate presiding officer, despite a majority vote, has opened a critical avenue for potential future legal challenges, risking the very legitimacy the proceedings aim to uphold. This intense debate underscores the profound implications of adhering strictly to constitutional mandates in matters of such high importance. 

The non-legal background of the current Senate President has, in effect, exposed a previously dormant constitutional vulnerability, demanding rigorous examination of both procedure and precedent. The nation watches as this constitutional crisis unfolds, with the integrity of the impeachment process hanging in the balance.

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