Senate Republicans voted down an effort Wednesday to halt President Donald Trump’s war against Iran, demonstrating early support for a conflict that has rapidly spread across the Middle East with no clear U.S. exit strategy.

The legislation, known as a war powers resolution, failed on a 47-53 vote tally. The vote fell mostly along party lines, though Republican Sen. Rand Paul of Kentucky voted in favor and Democratic Sen. John Fetterman of Pennsylvania voted against.

The war powers resolution gave lawmakers an opportunity to demand congressional approval before any further attacks are carried out. The vote forced them to take a stand on a war shaping the fate of U.S. military members, countless other lives and the future of the region.

Underscoring the gravity of the moment, Democratic senators filled the Senate chamber and sat at their desks as the voting got underway. Typically, senators step into the chamber to cast their vote, then leave.

“Today every senator — every single one — will pick a side,” Senate Democratic Leader Chuck Schumer said before the vote. “Do you stand with the American people who are exhausted with forever wars in the Middle East or stand with Donald Trump and Pete Hegseth as they bumble us headfirst into another war?”

Sen. John Barrasso, second in Senate Republican leadership, said during the debate that GOP senators were sending a message that Democrats are wrong for forcing a vote on the war powers resolution.

After launching a surprise attack against Iran on Saturday, Trump has scrambled to win support for a conflict that Americans of all political persuasions were already wary of entering. Trump administration officials have been a frequent presence on Capitol Hill this week as they try to reassure lawmakers that they have the situation under control.

Defense Secretary Pete Hegseth said Wednesday that the war could extend eight weeks, a longer time frame than has previously been floated by the Trump administration. He also acknowledged that Iran is still able to carry out missile attacks even as the U.S. tries to control the country’s airspace.

U.S. service members “remain in harm’s way, and we must be clear-eyed that the risk is still high,” Gen. Dan Caine, chairman of the Joint Chiefs of Staff, said at the same press conference.

Six U.S. military members were killed over the weekend in a drone strike in Kuwait.

Trump has also not ruled out deploying U.S. ground troops. He has said he is hoping to end the bombing campaign within a few weeks, but his goals for the war have shifted from regime change to stopping Iran from developing nuclear capabilities to crippling its navy and missile programs.