Senate Democrats blocked a $1 trillion annual defense bill Tuesday, refusing to advance the bipartisan package that would substantially increase Pentagon spending, including a pay raise for the troops, in protest of President Donald Trump’s war against Iran.

Senate Democratic Leader Chuck Schumer announced his opposition and other key Democrats said they could not support the annual bill, known as the National Defense Authorization Act, as the war drags into a fifth month with no clear endgame in sight. The tally was 50-46, failing largely along party lines to reach the threshold needed.

“The NDAA cannot become a permission slip for that recklessness that we see occurring in Iran,” Schumer, of New York, said ahead of voting.

“Donald Trump does not get to drag the American people deeper into a war he cannot explain and does not know how to end—and then demand that Congress look the other way.”

The Senate vote comes a day after the White House formally notified Congress that it had resumed bombing strikes against Iran, effectively undoing the fragile ceasefire in the U.S.-Israel led conflict that has resulted in economic disruptions, including volatile gas prices ahead of the midterm elections.

Congress has tried repeatedly to slap guardrails on the administration, voting more than 10 times on various war powers resolutions that would halt hostilities. But those efforts have not succeeded, and most Republicans in the House and Senate majorities back Trump.

Senate Majority Leader John Thune called the defense package a good bill and implored his colleagues to provide the resources to ensure the U.S. is kept safe.