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

Hillary ClintonHillary Diane Rodham ClintonTop Democratic pollster advised Biden campaign to pick Warren as VP Longtime Democratic pollster: Warren 'obvious solution' for Biden's VP pick How Obama just endorsed Trump 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 TrumpMinneapolis erupts for third night, as protests spread, Trump vows retaliation Stocks open mixed ahead of Trump briefing on China The island that can save America 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 GrahamSenate Democrats pump brakes on new stimulus checks Comey, Rice, Clapper among GOP senator's targets for subpoenas amid Obama-era probe Schumer: GOP should 'stop sitting on their hands' on coronavirus bill 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.