Sen. Tom Cotton, R-Ark., discusses Donald Trump's naming of Lt. Gen. H. R. McMaster as the new national security adviser to replace Michael Flynn and if there's a Trump foreign policy doctrine.Feb. 21, 2017
UP NEXT
At heart of special counsel's probes: Trump trying to wield power he no longer had
01:42
Brennan: Intel community may never fully know what was compromised by Trump
06:54
Maddow: 'The harm is done,' Trump shattered U.S. reputation for protecting allies' intel
02:17
Coded comments from GOP congressmen add to concerns about violence around Trump case
07:17
Maddow on Trump indictment: 'He knew it was wrong when he did it'