showing a witness a document and explaining the context of it. what this means is that the mueller team has enough documents that they feel it's appropriate to interview reince priebus at this point. by the way, it doesn't mean this will be the last time they interview him. repeated interviews are common. but it does suggest that they are pretty far along in their investigation, and certainly not at the beginning. >> you talk about a guy who was in the room when it happens -- to paraphrase hamilton. i mean, he -- you know, he traveled with the president, as many of the people in the president's inner circle did probably more than most chief of staffs would have. >> i think a lot of that, if you recall back during the campaign and in the beginning of this administration, there was a feeling that you needed to be close to the president, or the candidate at the time, because he would listen to the last person he sought information from and that's how he would make his decision. and they just wanted to have access to the president. reince priebus was in that category. he and others in the top echelon of the campaign and the administration did spend a lot of time with the president.