Former U.S. Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE on Monday ripped 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 Syria and allow Turkey to carry out an operation in the region, warning it will damage America's standing with its allies.

"We must always have the backs of our allies, if we expect them to have our back," Haley tweeted. "The Kurds were instrumental in our successful fight against ISIS in Syria. Leaving them to die is a big mistake. #TurkeyIsNotOurFriend."

We must always have the backs of our allies, if we expect them to have our back. The Kurds were instrumental in our successful fight against ISIS in Syria. Leaving them to die is a big mistake. #TurkeyIsNotOurFriend — Nikki Haley (@NikkiHaley) October 7, 2019

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The White House announced late Sunday that Turkey will soon be launching a military operation in northern Syria and that U.S. troops will no longer be “in the immediate area” when it happens. The U.S. had more than 1,000 troops deployed in northern Syria, working closely with the Kurdish-led forces.

Multiple press reports early Monday indicated that U.S. troops had already started their withdrawal. Republican lawmakers have lined up to criticize the decision, warning that it will lead to the slaughter of Kurdish allies and lay the foundation for a resurgence of ISIS.

Despite the backlash, Trump doubled down on his decision Monday in a series of tweets in which he said it is time to remove the U.S. from "ridiculous endless wars."

Haley served as ambassador to the United Nations from the beginning of the Trump administration until the end of 2018. During her tenure, she advocated for an involved U.S. policy in Syria, speaking out against the Assad government in response to its violence against civilians.

The former South Carolina governor is widely considered a future Republican candidate for higher office. She has occasionally criticized Trump since leaving the administration on matters of policy and rhetoric.