March 25 (UPI) — Republican senators have again backed President Donald Trump’s war against Iran, blocking a Democratic-led effort to curb his ability to wage war without congressional approval.

The Senate voted 53-47, mostly along party lines, on Tuesday evening to block Democrats’ war powers resolution, the third time Senate Republicans have blocked a resolution to require the removal of U.S. forces from hostilities against Iran unless Congress authorizes them.

Sen. Rand Paul of Kentucky was the only Republican to vote in favor of the motion with his Democratic colleagues, while Sen. John Fetterman of Pennsylvania was the only Democrat to vote against it with the GOP lawmakers.

Since the war began on Feb. 28, when the United States and Israel attacked Iran, Democratic lawmakers have argued the war is unconstitutional because only Congress has the power to declare war, while Republicans contend Trump is within his authority as commander in chief to defend the country.

Sen. Chris Murphy of Connecticut said he forced the vote Tuesday to have debate on Trump’s war in Iran.

“This is increasingly important because this war is spiraling out of control,” he said in a video posted to social media ahead of heading into the Senate.

“The cost of plastic just doubled, prices at the pump are sky high, the Strait of Hormuz is still shut down, new wars are breaking out in the region, we’ve had a dozen Americans killed, $2 billion being spent a day and for what!”

From the floor, Senate Minority Leader Chuck Schumer, D-N.Y., called on Republicans to vote in favor of the resolution, saying it was time for the war to come to an end.

“The war is expanding, and the Senate has an obligation to step in,” he said.

“I say to my Republican colleagues: if there was ever a time to stand up for the authority of the Senate, stand up for the powers given to us through the Constitution, the time is now.”

Sen. Jim Risch of Idaho, who has repeatedly argued against the war powers resolution, took to the floor again on Tuesday to say the Democrats were going to receive the same negative result as they had the two previous times.

Iran started the war, he said, pointing to the Iran hostage crisis of 1979 and stating that the Islamic regime has since killed thousands of Americans.

“The president of the United States said, ‘We have had enough.’ He had very good reasons to pull the trigger at the time that he did and… The fact of the matter is, we are in conflict,” he said, stating the Senate needs to back the Americans fighting in the war and their president.

“We all know this isn’t going to go on very long, but it needs to be done.”

The vote was held less than a week after Democrats used the war powers resolution to force a vote on Wednesday on a similar motion, which Republicans blocked in the same 53-47 outcome. Both Paul and Fetterman voted against their parties.