joining us, dershowitz and wisenberg. we'll also get into the can cantank cantankerous -- he seems to leave a possibility of a very narrow set of questions on obstruction. alan, i'll go to you first. what might be the wisdom in that? >>i think giuliani's tactic is to be able to say to the public, look, our president was willing to speak and mueller turned him down. i think he's mueller an offer that mueller can't really accept. he's putting forth a kind of narrow window. if mueller accepts it, then game on and we'll see some narrow questioning.