david cay johnson, you've been writing about this for a long time. why does trump trump? why can't he stop doing this? >> well, because to donald other people are simply items, and objects. they're not human beings. donald is entirely transactional. whatever gets donald what he wants, he will do. there's no more coral to donald trump. not paying bills, attacking somebody as terrible whom you said just recently was wonderful he's done this all his life. you can be his friend today, his enemy next week. it all depends on the moment. >> he thought nothing well of barack obama until barack obama was nice to him then he thought barack obama was great. inside of trump world, there's the rumors that there are two camps, there's bannon world, which still shocks me someone like bannon could be near the white house, but he is. and pence world. do either of those camps feel concerned about donald trump's inability to control himself? >> for now the relationship between the bannon camp and the previous camp, the populists and the mainstream, seems to be functional based on my reporti