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Senate advances bill aimed at ending Iran war as Cassidy, after primary loss, flips to support

Four Republicans joined Democrats as the Senate voted 50-47 to advance a measure requiring congressional approval for further military action against Iran.

  • On Tuesday, the U.S. Senate advanced a war-powers resolution to end the Iran conflict unless President Donald Trump obtains congressional authorization, marking a rare rebuke 80 days after hostilities began.
  • Under the 1973 War Powers Act, a president may wage military action for 60 days before requiring congressional approval; the window expired in late April despite the administration's claim that hostilities had 'terminated'.
  • Republican Senator Bill Cassidy, recently defeated in his primary, provided the decisive vote for the 50-47 tally, joining GOP colleagues Rand Paul, Susan Collins, and Lisa Murkowski in breaking with party leadership.
  • House Republicans are expected to block the measure on Wednesday, while the resolution faces a near-certain presidential veto; Vice President JD Vance stated the administration remains 'locked and loaded' for military operations.
  • Nearly two-thirds of American voters believe Trump has failed to adequately explain the war's necessity, according to an Ipsos poll released earlier this week, as Democrats leverage this momentum to challenge the conflict.
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Center

Cassidy breaks with Trump on Iran, spending after reelection defeat

(The Center Square) − U.S. Sen. Bill Cassidy, R-La., broke with President Donald Trump on multiple fronts this week after losing his reelection bid, including joining a Senate vote Tuesday to advance a measure aimed at ending U.S. military action…

Center

The U.S. Senate has launched a resolution aimed at greater control of the government in its warfare in Iran.

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9NEWS Denver broke the news in Denver, United States on Tuesday, May 19, 2026.
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