>> president trump has often heaped praise on the military leaders he hired to start off this effort and work in the white house. they were often dubbed the adults in the room. he loved it early on when someone told him that general mattis' nickname was mad dog. trump liked that branding. the truth was, while mattis has earned four stars on his shoulders the hardware, in the marine corps, he was equal parts warrior and scholar, a well trained fighter, and a well read man. since he arrived at the pentagon, some have taken to calling him by a different nickname, moderate dog, for his moderating influence in the trump circle. and today we learned he was the last to go, the last of the generals, the so-called human guardrail in the trump administration is coming down. with us tonight to talk about it, general barry mccaffery, decorated combat veteran of the vietnam, distinguished service cross, former battle field commander in the gulf war, retired u.s. army