I don't want to get into specific witnesses at this point but Rudy Giuliani is clearly at the center of a lot of this. The spadework for this phone call may very well have been done by Rudy Giuliani. It appears to me from reading the transcript that the Ukraine President had a pretty good idea of what might happen on this call. And so, why that's the case and how that was communicated to him, we need to find out, and I wouldn't be a bit surprised if Rudy Giuliani is a part that have answer.