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

Hillary ClintonHillary Diane Rodham ClintonBiden prepares to confront Putin Ending the same-sex marriage wars Trump asks Biden to give Putin his 'warmest regards' 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 TrumpBiden prepares to confront Putin Biden aims to bolster troubled Turkey ties in first Erdoğan meeting Senate investigation of insurrection falls short 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 GrahamProgressives want to tighten screws beyond Manchin and Sinema GOP senators applaud Biden for global vaccine donation plans Lindsey Graham: Dismissal of Wuhan lab leak theory cost Trump 2020 election 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.