Lawrence on Trump: You have never seen this before in a president

The Last Word with Lawrence O'Donnell 10/10/17
Lawrence on Trump: You have never seen this before in a president

Lawrence O'Donnell explains the "historic" nature of the tweet President Trump issued in response to Bob Corker and Trump's new challenge to compare IQs with Rex Tillerson, after Tillerson reportedly called Trump a "moron." Duration: 12:17