already 87 pages done, he tweeted. all this, as the increasingly embattled president took fire from the secretary of state he fired. rex tillerson, offering up a harsh assessment of the president he served. >> he is a challenging individual. a man who is pretty undisciplined, doesn't like to read, doesn't read briefing reports, doesn't like to get into the details of a lot of things. >> reporter: tillerson saying he needed to remind the president to obey the law. >> we did not have a common value system. when the president would say, here's what i want to do, and here's how i want to do it, and i'd have to say to him, well, mr. president, i understand what you want to do, but you can't do it that way. it violates the law. >> reporter: after tillerson's words today, the president tweeted, tillerson didn't have the mental capacity needed. he was dumb as a rock. he was lazy as hell. >> jon karl with us live tonight