himself has weighed in? reporter: that s right. ca campaigning in iowa, where he says that he himself is not going to be party to any kind of witness swap because he wasn t involved in this scheme and did othing wrong. but at the end of the day, norah, it s up to the senators. if 51 vote to hear from joe biden or john bolton or anyone anyone else, then those arbpoenas are going to go out. o donnell: all right, nancy, thank you. tonight, president trump is back in washington after a quick trip to the world economic forum in ecitzerland. but even while he was on the eorld stage, the president was focused on what was happening on the senate floor. ben tracy reports tonight from the white house. we have a great case. reporter: before leaving the world economic forum in switzerland, president trump deid there s somewhere else he d like to be. will you please be seated? reporter: front and center at his impeachment trial. te i d love to go. wouldn t that be great? wouldn t that b