Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) is expressing concerns after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE tweeted that he did “not know” his top envoy in the fight against the Islamic State in Iraq and Syria (ISIS), Brett McGurk.

“Uhhhh...you don’t know your own coordinator of the anti-ISIS campaign?” Murphy tweeted late Saturday. “Over the past 5 years, no one has done more to put ISIS on its heels than Brett. We all know and rely on him.”

“The fact that our President has no clue who Brett is should scare the hell out of every American.”

Uhhhh...you don’t know your own coordinator of the anti-ISIS campaign?



Over the past 5 years, no one has done more to put ISIS on its heels than Brett. We all know and rely on him. The fact that our President has no clue who Brett is should scare the hell out of every American. https://t.co/m7SNU1SA7z — Chris Murphy (@ChrisMurphyCT) December 22, 2018

McGurk abruptly resigned on Friday over disagreements with Trump’s decision to pull U.S. troops out of Syria.

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Trump criticized McGurk as a “grandstander” over the departure, but said in a tweet that he did not know the official.

“Brett McGurk, who I do not know, was appointed by President Obama in 2015,” the president tweeted. “Was supposed to leave in February but he just resigned prior to leaving. Grandstander? The Fake News is making such a big deal about this nothing event!”

Brett McGurk, who I do not know, was appointed by President Obama in 2015. Was supposed to leave in February but he just resigned prior to leaving. Grandstander? The Fake News is making such a big deal about this nothing event! — Donald J. Trump (@realDonaldTrump) December 22, 2018

McGurk, who was reportedly planning to leave the administration in February, submitted his resignation soon after Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE announced his own resignation over differences with Trump on his Syria strategy.

Trump’s plan to withdraw the 2,000 troops currently in Syria has rattled Pentagon officials and lawmakers. McGurk had criticized the hypothetical move as “reckless.”