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Hillary Clinton calls Trump's Syria pullout a 'sickening betrayal' of allies

Hillary ClintonHillary Diane Rodham ClintonBon Jovi to campaign with Biden in Pennsylvania The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in Biden gets late boost with key union endorsement MORE on Monday slammed the Trump administration's decision to pull U.S. troops out of northern Syria. 

"Let us be clear: The president has sided with authoritarian leaders of Turkey and Russia over our loyal allies and America’s own interests," Clinton, a former secretary of State and senator and President TrumpDonald John TrumpIvanka Trump, Jared Kusher's lawyer threatens to sue Lincoln Project over Times Square billboards Facebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 Sanders hits back at Trump's attack on 'socialized medicine' MORE's Democratic rival in 2016, tweeted.

"His decision is a sickening betrayal both of the Kurds and his oath of office."

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The White House said late Sunday that U.S. troops would be pulled from the region ahead of a military operation Turkey would soon be launching. 

The move was also criticized by Trump's former ISIS envoy Brett McGurk and Sen. Lindsey GrahamLindsey Olin GrahamFacebook, Twitter CEOs to testify before Senate Judiciary Committee on Nov. 17 The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in Jaime Harrison raises million in two weeks for South Carolina Senate bid MORE (R-S.C.), an ally of the president

The U.S. had more than 1,000 troops deployed in Syria, working closely with the Kurdish YPG, which leads the Syrian Democratic Forces (SDF).

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."

"WE WILL FIGHT WHERE IT IS TO OUR BENEFIT, AND ONLY FIGHT TO WIN,” the president said.