Circumstances. all they have to do is ask him one question, "did you know about the meeting in the trump tower with your son," if you answer that question truthfully, that he didn't know, if that in fact is the truth, he could still be charged with perjury, lying to a government official because we have michael cohen who says he did know. you you never allow your client to see something that can be contradicted by another witness because the prosecution can choose to believe that other witness. >> mark: if you had president trump as a client, though, he's a very good, gregarious guy who was qu...