welcome back. fallout from the resignation of national security advisor michael flynn barely on the job for three weeks. senate intelligence committee will investigate the conversations between flynn and the russian ambassador to the united states. committee chairman richard byrd says the committee is going to aggressively continue it's oversight responsibilities. but what is the scope of this investigation? joining me now is senator mark warner, he's the ranking democrat on the senate intel committee, the way it works, it truly is a -- this is not a hierarc hierarchy, correct me if i'm wrong, in the tradition of basically co-chairs, fair to say? >> it is. he's the chair, i'm the vice-chair. this is really one of the few committees that still works in a bipartisan way. maybe because a lot of it's behind closed doors, but we actually go after something in an organized fashion. >> well, let's talk about the scope of the investigation. >> sure. >> what is is it?