of a dark, dark storm coming for president trump. rkh donald trump for a en decade, if not longer, long before he became president of the united states.he did a lot him and a lot of fixing for him. >> yeah. but he's never had light shined like this on his work. now i think he's going to have to ask himself does he want to cooperate with an investigation looking into what an advsary did to america, or does he want to stand close to this president. this president, by saying i can pardon myself, what he's really saying, is i can pardon you. that, to me, is also obstructive and may cause problems for the esident. >> he hasn't been charged with anything, michael cohen. if he does flip, though, would it be to his advantage to flip before charges are formally fired or after? >> always before. but it's not too late afterges . that's something that may be negotiated now. as a former prosecutor, you know, the sooner someone is willing to cooperate, the more likely that they are telling you the truth.