is talking to because you know other people as an investigator that you you would want to go talk to. if you see that michael cohen is talking to such a certain phone number, multiple time a day and it's not a relative or best friend, that's probably a person you want to go do an interview of. that's one purpose it serves. my guess is this is just a small part of the investigation. >> would he be notified in. >> no. >> this is covert surveillance be p. >> law enforcement would not refer to a pin register, frank can correct me if he thinks i'm wrong. we wouldn't refer to it as surveillance but you are gathering data. >> thanks so very much. coming up, locked and loaded. president trump speaking to the at the nra annual convention. months after promising to take on the gun lobby. man: it takes a lot of work to run this business,