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Retired Justices to Weigh In on Duterte Impeachment Trial Rules

Four former Supreme Court justices are set to appear before the Senate impeachment court on Wednesday as it considers whether the current conviction threshold remains valid. The development marks the 26th day of Vice President Sara Duterte's impeachment proceedings.

LSN Philippines · 16 September 2026

MANILA – The impeachment trial of Vice President Sara Duterte enters a critical phase this week as retired members of the Philippines' highest court prepare to submit arguments on a fundamental procedural question: whether 16 votes remain necessary to secure a conviction.

The four amici curiae, or friends of the court, are scheduled to appear before the Senate impeachment court on Wednesday as senator-judges examine the constitutional and legal foundations underpinning the conviction threshold. Their participation reflects the high-stakes legal dimensions of the ongoing proceedings, now in their 26th day.

The appearance of the retired justices underscores the significance of the conviction requirement debate, which could have substantial implications for the trial's outcome. The Senate must determine whether the threshold established at the trial's outset remains applicable as the case progresses.

Impeachment proceedings in the Philippines require a two-thirds supermajority vote to convict and remove an official from office. The specific application of this standard to the current trial has become a focal point of legal scrutiny during the vice president's proceedings.