Senate’s Lower Conviction Threshold for VP Sara Faces Supreme Court Challenge

The Senate impeachment court’s decision to drop a fixed 16-vote rule for convicting Vice President Sara Duterte is now before the Supreme Court, after former Executive Secretary Victor Rodriguez asked the justices for a temporary restraining order and to nullify the chamber’s 13–1 vote.

What the Senate Decided

Sitting as an impeachment court on Sept. 23, senators voted 13–1 to grant Sen. Erwin Tulfo’s appeal and overturn Presiding Officer Francis “Chiz” Escudero’s July 6 ruling that conviction required 16 votes—two-thirds of all 24 senators—according to Manila Bulletin, Philstar, and Inquirer.

Escudero cast the lone opposing vote but said he would enforce the court’s judgment. Six senator-judges did not take part: Alan Cayetano, Pia Cayetano, Christopher “Bong” Go, Imee Marcos, Camille Villar, and Robin Padilla (Manila Bulletin).

The chamber kept the Constitution’s two-thirds requirement, but agreed that senators who are detained, suspended, medically incapacitated, sought by authorities with unknown whereabouts, beyond the Senate’s coercive processes, or similarly situated should not be counted in the base used on verdict day.

With roughly 20 senator-judges described as capable of participating, two-thirds is 13.33, which Escudero said must be rounded up—bringing the working threshold from 16 to 14, according to Manila Bulletin and Philstar. Escudero clarified the interpretation applies only to this case (pro hac vice).

Rodriguez Goes to the Supreme Court

In a petition for certiorari and prohibition filed Thursday, Rodriguez argued the Senate committed grave abuse of discretion and effectively rewrote the Constitution by treating “all the Members of the Senate” as meaning only members “capable of participating,” Inquirer reported. He asked the Court to nullify the Sept. 23 ruling, reinstate the 16-vote threshold, and urgently issue a TRO and/or preliminary injunction.

“This petition presents a question not merely of parliamentary procedure but of constitutional amendment,” Rodriguez said in the petition, according to Inquirer.

Inquirer identified four senators unable to attend under the disputed categories: Jinggoy Estrada and Rodante Marcoleta (detained over separate plunder cases); Ronald “Bato” dela Rosa (avoiding an ICC arrest order); and Loren Legarda (on extended medical leave since Aug. 3).

Defense Also Weighing a TRO

Manila Bulletin reported that VP Duterte’s defense is considering its own Supreme Court TRO. Spokesperson Atty. Michael Wesley Poa said a TRO is “definitely an option,” but the team has not yet decided. Participation remains ad cautelam.

Why the Numbers Matter

The Sept. 23 vote does not decide the impeachment itself. It changes the arithmetic of conviction. Whether that new math stands now depends in part on how the Supreme Court treats Rodriguez’s petition—and any parallel move by the defense.