Senator Bill Cassidy of Louisiana cast a surprising procedural vote in the Senate to advance legislation that would limit former President Donald Trump's authority over military actions in Iran.This move came shortly after Cassidy suffered a high-profile primary election loss, where Trump had endorsed his opponent.

The bill, aimed at curbing presidential war powers, requires the President to seek congressional approval for military engagements or withdraw troops.

Cassidy, who had previously been targeted by Trump for his vote to impeach him following the January 6 Capitol events, joined all Democrats and three other Republican senators—Lisa Murkowski, Susan Collins, and Rand Paul—in supporting the motion.The procedural vote passed 50-47, moving the legislation to the next stage, although it does not yet enact the restrictions.Cassidy finished third in the Louisiana primary behind Rep.Julia Letlow and State Treasurer John Fleming, who will advance to a runoff.

This vote highlights Cassidy’s break from Trump-aligned Republicans and reflects ongoing congressional efforts to assert checks on executive military authority.