obtain guilty pleas on those counts, he could add to the already immense pressure on manafort by extending his potential prison sentence and inflating his legal bills. all right. there is a lot to get through here. joining us now, former federal prosecutor, a professor of law at the university of michigan and poll tiitics editor of the y beast. >> this business, first of all, of donald trump saying flipping should almost be illegal. obviously he's sending a message about who he likes and who he doesn't like and what paul manafort should do. but how do you evacuate that comment. >> i think it is a terrible comment for law enforcement and anybody that cares about criminal justice. cooperators are used every day. there are a lot of safe guards in place to ensure they are telling the truth, like requiring corroborating evidence and jury instructions that tell them to use additional