to arrange a possible back channel communication between the u.s. and russia, but the uae connection could expand mueller's investigation to concerns of additional foreign influence in the 2016 election. nader has been cooperating with investigators. the big question is what if anything mueller has in store to president trump, including whether he obstructed justice. >> i think really that obstruction piece will be the final element of this and that what we're going to more likely see is, you know, sort of these dots in the center being connected. >> reporter: looming large is whether the special counsel will demand a sit-down interview with president trump himself. >> i've always wanted to do an interview because, look, there's been no collusion. >> reporter: for now, mr. trump's attorney, rudy giuliani, says any interview is still under negotiation. >> i think he shouldn't. i know how convinced he is that he didn't do anything wrong and wants to explain it, and i've seen other people get into trouble thinking that, innocent people. >> reporter: to be clear, none