Republican senators are publicly urging President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE to back down from his decision to withdraw U.S. troops from northern Syria.

The move, announced by the White House on Sunday night, has emerged as a flashpoint between Trump and his GOP allies, adding another headache for Republicans amid an unrelated impeachment fight.

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Sen. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (R-Pa.), who represents a key 2020 battleground state, asked Trump to reverse course, citing concerns that the decision would bolster the Islamic State in Iraq and Syria (ISIS) and would have ramifications for other alliances.

"This betrayal of the Kurds will also severely harm our credibility as an ally the world over. President Trump should rethink this decision immediately," Toomey said in a statement.

Sen. Ben Sasse Benjamin (Ben) Eric SasseWhy a backdoor to encrypted data is detrimental to cybersecurity and data integrity McEnany says Trump will accept result of 'free and fair election' McConnell pushes back on Trump: 'There will be an orderly transition' MORE (R-Neb.) added that unless Trump changes his mind, the "bad decision will likely result in the slaughter of allies."

“I hope the president will listen to his generals and reconsider," he said.

The White House announced Sunday night that Turkey was moving forward with a long-threatened offensive in northeastern Syria and that U.S. troops would not be in the “immediate area” when it happens.

Trump's decision, which came after a call with Turkish President Recep Tayyip Erdoğan, reportedly surprised the Department of Defense (DOD). An administration official told Foreign Policy that "the entire DOD leadership was opposed to the endorsement and the withdrawal.”

The Pentagon said in a statement Monday that it does not support Turkey taking military action in northern Syria.

Trump's decision has also been panned by several other Republican lawmakers, including traditional allies of the president.

Sen. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.), who emerged as a vocal defender of Trump after his White House win, is publicly criticizing the decision and urging the president to back down.

"No matter what President Trump is saying about his decision, it is EXACTLY what President Obama did in Iraq with even more disastrous consequences for our national security," Graham tweeted.

"Unlike President Obama, I hope President Trump will reassess and take sound military advice," he added.

It wouldn't be the first time that Trump said he would pull U.S. troops from Syria only to back down. Trump called for a complete withdrawal from Syria in December, but ultimately reversed course amid protest from the Pentagon and Republicans on Capitol Hill.

But Trump appeared to be doubling down on his decision on Monday, saying it was time to yank the United States out of "ridiculous Endless Wars."

"The Kurds fought with us, but were paid massive amounts of money and equipment to do so. They have been fighting Turkey for decades. I held off this fight for almost 3 years, but it is time for us to get out of these ridiculous Endless Wars, many of them tribal, and bring our soldiers home,” Trump said in a series of tweets.