exculpate trump junior. >> if you try to rob a bank, it doesn't matter whether or not you're successful in robbing that bank. glenn, one other thing, "the washington post" editorial board is saying enough's enough. time for mueller to bring out the big guns. it's time for him to subpoena the president. glenn, what do you think? >> katy, i don't know that bob mueller can subpoena the president because -- an i worked for bob mueller, he was my chief of homicide right here in d.c. we're governed by the policies of the department of justice. and ordinarily we don't subpoena targets of an investigation. why is that? because a target of an investigation by definition has a right against sel self-incrimination. you don't become a target unless the investigators are looking to indict you. so we don't know that he's ripened into a target but if he has ripened into the target, then doj policy would say bob