Former Senate President Juan Miguel Zubiri has joined the minority bloc in the Philippines' upper chamber, citing the presence of "four traitors" in the majority coalition and signaling potential instability in President Ferdinand Marcos Jr.'s legislative agenda.
Zubiri, who served as Senate President until being ousted in May 2024, told Rappler that the betrayal by unnamed colleagues within the majority made it impossible for him to remain aligned with the administration.
The defection matters less for the immediate vote count—the majority still controls the Senate—than for what it reveals about the fragility of political coalitions in Manila. Philippine politics operates through shifting alliances rather than disciplined parties, and Marcos's legislative support depends on personal relationships and patronage rather than ideological commitment.
Zubiri's specific grievance remains unclear. He has not publicly identified the "four traitors," and his statement to Rappler focused on personal betrayal rather than policy differences. But the timing suggests the dispute relates to his removal as Senate President, a position he lost to Senator Chiz Escudero following what Zubiri characterized as a coordinated effort by former allies.
For Marcos, the defection complicates an already challenging legislative environment. The administration is pushing tax reforms, infrastructure funding, and constitutional amendments—all of which require Senate approval. Losing Zubiri, a skilled legislative operator with ties to Mindanao's political establishment, weakens the president's ability to manage the upper chamber.
The move also strengthens the minority, which has grown increasingly vocal in challenging administration policies. By adding Zubiri's experience and networks, the opposition gains a more credible voice on procedural matters and coalition-building.
But this is Philippine politics—alliances shift quickly. Zubiri supported Marcos in the 2022 election and served as his Senate President for two years. The "traitors" he now denounces were presumably his allies during that period. There is no guarantee his current opposition stance will last any longer than his previous support.
"Watch what happens when the budget comes up," said a Senate staffer who requested anonymity. "That's when you see who's really opposition and who's just negotiating for a better deal."
Ten countries, 700 million people, one region—and in the Philippines, legislative majorities are less about votes than about who remembers their promises.
