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Senate advances resolution to limit Trump's Iran war powers for first time, after 4 Republicans defect

The 50-47 vote drew support from four Republicans and came as Democrats sought to curb unilateral military action against Iran.

  • On Tuesday, the Senate advanced a resolution to limit President Donald Trump's war powers in Iran, discharging it from committee in a 50 to 47 vote after seven failed attempts.
  • Louisiana Sen. Bill Cassidy switched sides to join Democrats, marking his first time supporting such a measure after Republicans had previously blocked similar Iran war powers resolutions.
  • Led by Democratic Sen. Tim Kaine of Virginia, the resolution gained support from Republicans Susan Collins, Lisa Murkowski, and Rand Paul; Kaine cited rising gas prices ahead of Memorial Day as evidence of economic toll.
  • President Trump announced Monday he would not follow through with 'scheduled' attacks on Iran, though he would likely veto the measure if both chambers approved it.
  • Senate Minority Leader Chuck Schumer urged Republicans to 'break the cycle' on war powers, as Democrats contend the procedural advance carries significance and could influence the president's thinking on the war.
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KTHV broke the news on Tuesday, May 19, 2026.
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