Brett McGurk, Zero's "US envoy to anti-ISIS coalition", whatever that is, RESIGNS because his normal February RETIREMENT couldn't come soon enough. POTUS Tweets that he doesn't even know the guy. LOL! IAC, apparently Brett felt he needed to make a statement of some sort, so walked out, despite him already scheduled to leave in February. McGurk, who was appointed by Zero in 2015, apparently couldn't overcome the shock of US withdrawal from Syria.  That and, of course, his job also ended.  Somehow can't reconcile the President not knowing him if he was doing anything for US.  I'm going to guess DS operative in control of activities outside the PDB.