Senator John Fetterman cast the deciding vote Wednesday to block a Democratic War Powers Act resolution attempting to halt Trump's military campaign in Iran, marking his seventh such vote against the effort. Three Republicans (Murkowski, Collins, Paul) broke ranks to support limiting Trump's war powers, but Democrats fell short of the votes needed to advance it — making Fetterman's opposition mathematically decisive. The headline's framing as 'single-handedly tanks' obscures that Republican defections also limited the resolution's viability, and that Fetterman has consistently voted this way throughout the conflict rather than representing a sudden reversal.