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

Hillary ClintonHillary Diane Rodham ClintonKaine: Obama called Trump a 'fascist' during 2016 campaign Clinton says Zuckerberg has 'authoritarian' views on misinformation Des Moines Register endorses Elizabeth Warren as Democratic presidential nominee 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 TrumpKaine: Obama called Trump a 'fascist' during 2016 campaign Kaine: GOP senators should 'at least' treat Trump trial with seriousness of traffic court Louise Linton, wife of Mnuchin, deletes Instagram post in support of Greta Thunberg 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 GrahamSunday shows preview: Lawmakers prepare for week two of impeachment trial Trump defense team signals focus on Schiff Trump legal team offers brisk opening defense of president 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.