Susan Rice rips Trump over McGurk tweet: ‘I can assure you’ Obama knows him well

Former national security adviser Susan Rice ripped President TrumpDonald John TrumpMcCabe says he was fired because he 'opened a case against' Trump McCabe: Trump said 'I don't care, I believe Putin' when confronted with US intel on North Korea McCabe: Trump talked to me about his election victory during 'bizarre' job interview MORE late Saturday for declaring he doesn't know his top envoy in the fight against the Islamic State in Iraq and Syria (ISIS), saying that she "can assure you" former President Obama "knows him well."

"The fact that you say you don’t know @brett_mcgurk speaks volumes about your commitment to fighting ISIS @realDonaldTrump. Why don’t you know the man who has done more than any civilian to degrade ISIS? I can assure you @BarackObama knows him well," tweeted Rice, who was Obama's national security adviser for most of his second term. 

The envoy, Brett McGurk, resigned on Friday because he reportedly disagreed with Trump's decision to withdraw troops from Syria, which Trump claimed he was doing because the U.S. had defeated ISIS in that region.

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McGurk had reportedly planned to leave the position in February but decided to resign early. His resignation came a day after Defense Secretary James Mattis also resigned.

Trump in a tweet on Saturday suggested McGurk was being a "grandstander" and wrote that he doesn't know him. 

"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!" the president tweeted.