as you may recall, before white house staffers were voluntarily being interviewed by robert mueller's staff. the white house wasn't standing in the way. in this case, there was a change. of course, there was concern about executive privilege and those conversations sarah sanders had with the president, whether they should be protected. we don't know if there were limitations. i can tell you in talking to sources, sarah sanders, before she would go on the podium, she would talk to president trump. he was involved in what she said at that podium. then he would watch and they would talk about how she did at the podium. it would make sense that the investigators would want to interview her. the question is, were there guidelines, parameters given the executive privilege concerns? >> interesting, pamela brown, appreciate it. with me now is preet bharara. what do you make on the roger stone news? over and over he denied direct contact with wikileaks.