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De Lima set to argue impeachment conviction threshold before Senate panel

Rep. Leila de Lima is expected to lead the House prosecution's oral arguments Wednesday on how to interpret the constitutional two-thirds voting requirement for convicting impeached officials, according to fellow House prosecutor Rep. Chel Diokno.

LSN Philippines · 20 September 2026

MANILA — Rep. Leila de Lima is positioned to represent the House prosecution during Wednesday's oral arguments on a critical constitutional question affecting impeachment proceedings in the Senate.

The debate centers on how to properly interpret the two-thirds threshold mandated by the Constitution for convicting an impeached official. House prosecutor Rep. Chel Diokno disclosed De Lima's expected role in an interview, indicating the House panel's strategy for the upcoming hearing.

The oral arguments represent a significant procedural moment in the Senate's impeachment process, as the proper interpretation of voting thresholds could influence the outcome of ongoing or future impeachment cases. The two-thirds requirement has been a point of contention in Senate proceedings, with differing interpretations potentially affecting how votes are counted and validated.

De Lima's participation as the prosecution's lead voice underscores the importance the House places on the hearing. The outcome of Wednesday's arguments may establish precedent for how the Senate conducts impeachment trials and determines conviction standards moving forward.