we just heard from senate minority leader chuck schumer who wants a senate impeachment trial with witness testimony in contrast to the shorter trial senate republicans favor. joining us now to discuss cnn political commentator joe lockhart, president clinton's press secretary during his impeachment, cnn national security and legal analyst susan hennessey and political analyst david gregory. good to have all of you with us. great interview. as we're hashing over everything, this comes out of the letter chuck schumer sent to mitch mcconnell outlying the four witnesses he wants to hear from and saying clearly, if you have other people you think we should hear from who have firsthand knowledge of what we're talking about here, withholding aid to ukraine, let us know. i'm curious based on your history, as you sat there and listened to senator schumer lay out th out his case, what do you think the chances are we are going to see witnesses, some sort of real negotiation with mitch