but that might change rather quickly. one of the first conversations he's going to have is with bob mueller. they've worked together. he's going to call and ask jim comey for a briefing on the investigation. and one of the things he'll do is make a decision as to whether james comey would testify or not. apparently one of every conversation he had with the president, memos. and if bob mueller decides early on by looking at these memos and talking to jim comey that he wants to look at potential obstruction by the president or whoever else, he may not want james comey testifying because he's going to want the element of surprise or puts in a new grand jury. >> you've had your hand in two explainers.