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

Hillary ClintonHillary Diane Rodham ClintonDemocrats worry they don't have right candidate to beat Trump Krystal Ball credits Gabbard's upswing in 2020 race to 'feckless' Democratic establishment Outsider candidates outpoll insider candidates 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 TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 GrahamGraham says Trump should be allowed to undo DACA order The Hill's 12:30 Report: Dems, GOP dig in for public impeachment hearings The Hill's Morning Report - Witness transcripts plow ground for public impeachment testimony 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.