Democratic presidential contenders lined up to slam President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's move to withdraw U.S. forces from Syria as Turkey pursues a military operation, calling the decision "irresponsible" and "reckless."

The White House announced late Sunday that Turkey would be moving forward with a long-threatened offensive in northern Syria and that U.S. troops would not be in the “immediate area” when it happens.

"This decision is a betrayal of our ally in the fight against ISIS and risks American lives," Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) said in a tweet. "We have a president who is telling our allies and our adversaries that America doesn't keep her word."

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Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) also criticized the move, calling it "erratic."

"The President's decision to rapidly withdraw U.S. forces from N. Syria & abandon our SDF allies in the fight against ISIS risks our national security and jeopardizes our credibility," Bennet tweeted. "This is the kind of erratic foreign policy we’ve come to expect from Trump. And it's reckless."

Meanwhile, progressive Sens. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), who have been critical of U.S. involvement in the Middle East, warned the decision would lead to chaos.

"I support bringing our troops home from Syria," Warren tweeted. "But President Trump's reckless and unplanned withdrawal undermines both our partners and our security. We need a strategy to end this conflict, not a president who can be swayed by one phone call."

"I have long believed the U.S. must responsibly end our military interventions in the Middle East," Sanders said in a tweet. "But Trump’s abrupt announcement to withdraw from northern Syria and endorse Turkey’s incursion is extremely irresponsible. It is likely to result in more suffering and instability."