in ukraine earlier this week. joining me now. good evening to all of you. elliot, you first. a top russia and europe adviser on the national security counsel set to testify next week. if he corroborates taylor's testimony. what is the impact? >> well, the impact is profound and huge. he's the first white house official to testify here. we have heard from defense department officials. this is the first time this has actually reached the white house. and it's almost like the layers of an onion getting peeled back. a few days ago we had the president implicated for the first time. obviously the initial call memo. a few weeks ago. for the first time a witness pointed directly at the president being involved. so it will be significant that a white house staffer is going to speak up here.