that is the context in which this president now gets to pick a new supreme court justice. a president lets remember who once asked the fbi director for his personal loyalty and who rails against the attorney general for failing to shield him from a criminal probe. all of that matters because the supreme court will almost certainly be asked to rule on some of the most sensitive and significant aspects of the mueller investigation. they will likely be asked to rule on what the president can get away with. the president's lawyer has threatened a legal battle telling abc news if mueller tries to subpoena us, wear going to court. >> the president can going before a judge and say it's for purposes of harassment, we win that. >> that's what you intend to do if you're subpoenaed. >> we'll say you've got everything you need. what do you need us for. >> the president's own nominee can be the decisive vote in dermatology among.other questions whether the president himself has to testify in the mueller probe. i asked democratic senator elizabeth warren if that