Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) on Monday blasted 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’s decision to withdraw U.S. forces from northern Syria ahead of an invasion by Turkey, calling it “deeply disturbing."

“The President’s decision to withdraw U.S. forces from Northern Syria is a deeply disturbing development that betrays our Kurdish allies who have been instrumental partners in our mission to eradicate ISIS,” Pelosi said in a statement.

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“Despite what the President might say, ISIS remains a serious threat. This reckless, misguided decision undermines the efforts by our brave servicemembers and our allies to end ISIS’s tyranny,” she said.

Pelosi added that Trump is deserting an ally while attempting to appease Turkish President Recep Tayyip Erdoğan, whom she calls an "authoritarian strongman," by turning "operational responsibility" in the region over to Ankara.

"President Trump has abandoned our Kurdish partners,” said.

“This decision poses a dire threat to regional security and stability, and sends a dangerous message to Iran and Russia, as well as our allies, that the United States is no longer a trusted partner."

Numerous Republicans are also making rare breaks with the president on the issue.

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

Trump's decision reportedly came as a shock to Pentagon officials, with an administration official telling Foreign Policy “the entire [Department of Defense] leadership was opposed to the endorsement and the withdrawal.”