file a motion to quash. that is filed with the district court and court of appeals. a subpoena for live testimony has never been tested in court as to a president of the united states. there is a lot of language, articles and precedent against that. >> so he could do it, mueller. he could fail. it would take a lot of time and that really hurts mueller if he loses. >> i think it does because as long as the subpoena battle is open he will not want to say i closed the investigation. it will take a long time. although i think that the outcome is that mueller will win, we don't know. there is always litigation risks. >> so here is the other thing. the issue of the president wanting to do an interview. there are different schools of thought, him saying it as bs or means it. he has said it. here is what he said. >> are you going to talk to mueller? >> i'm looking forward to it,