Top US envoy in ISIS fight to resign over Trump's decision to pull out of Syria: reports

President TrumpDonald John TrumpDACA recipient claims Trump is holding ‘immigrant youth hostage’ amid quest for wall Lady Gaga blasts Pence as ‘worst representation of what it means to be Christian’ We have a long history of disrespecting Native Americans and denying their humanity MORE's special envoy to the fight against the Islamic State in Iraq and Syria (ISIS) submitted his resignation on Friday due to his disagreement with the president's decision to withdraw U.S. troops from Syria, according to multiple reports Saturday.

Brett McGurk, the special presidential envoy for the Global Coalition to Defeat ISIS at the State Department, was reportedly planning to the leave the administration in February, but accelerated his departure over Trump's plans to withdraw troops from Syria, sources told CBS News and NBC News.

McGurk told Secretary of State Mike PompeoMichael (Mike) Richard PompeoPompeo: US 'absolutely not' getting out of the Middle East Pompeo taking meeting about running for Kansas Senate seat: report Ex-US envoy in ISIS fight: 'There's no plan for what's coming' after US troop withdrawal in Syria MORE of his decision late Friday, sources told the networks. He is expect to resign on Dec. 31.

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The presidential envoy submitted his resignation one day after Defense Secretary James MattisJames Norman MattisKerry rips Trump’s ‘pull-out, walk-away presidency’ Macron: US 'retreat from Syria' won't change mission to eradicate ISIS Poll: Most Americans want US troops in Syria MORE announced his own resignation from Trump's Cabinet.

Mattis, who is slated to leave his post at the end of February, said in his resignation letter Thursday that he was stepping down over fundamental differences with Trump's views.

Mattis announced his resignation after he reportedly was unable to get Trump to change his mind on his Syria strategy. His resignation letter was filled with implicit criticism of the president's treatment of U.S. allies.

Trump's surprise decision this week to withdraw all 2,000 U.S. troops currently in Syria was met with opposition by Pentagon officials and members of the foreign policy establishment.

Days earlier, McGurk told reporters that he thought it would be "reckless" to pull the U.S. out of the region amid its ongoing fight with ISIS.

“I think it's fair to say Americans will remain on the ground after the physical defeat of the caliphate, until we have the pieces in place to ensure that that defeat is enduring," McGurk told reporters at the State Department at the time.

"It would be reckless if we were just to say, well, the physical caliphate is defeated, so we can just leave now. I think anyone who's looked at a conflict like this would agree with that," he said.

McGurk, an Obama appointee, had led U.S. efforts to combat the influence of ISIS in Syria, Iraq and Afghanistan since 2015.

The State Department declined to comment on the matter to The Hill on Saturday, citing a "lapse in appropriations" due to the partial government shutdown that started at midnight.

"Communications with the media will be limited to events and issues involving the safety of human life or the protection of property, or those determined to be essential to national security," a State Department spokesperson said.

The government entered a partial shutdown at midnight Friday after Congress was unable to reach a spending deal because it lacked Trump's demands for border wall funding.

The shutdown, which affects about 25 percent of the federal government, is the third shutdown in the past year.

— Updated 2:23 p.m.