there have been questions about when he's finally going to leave. so this is partly a swan song. but we can't forget the fact that laura jarrett is reporting, also, that it's going to be substantial and substantiative. so, yes, he's saying good-bye, but also clearly wants to make a very heavily -- a statement with a lot of heavy content. >> and shan wu, let me bring you in. one of the things that we don't know obviously, there are any number of topics that he could be discussing, why he doesn't want to testify publicly, for example. claims made in a book about whether or not the mueller office was pursuing charges against president trump, claims that the mueller office has denied wholeheartedly. james comey wrote an op-ed yesterday. i mean, there are any number of things that he could be addressing. >> right. i think he'll probably be expanding on what he thought might have been not fully represented in the attorney general's letters. but i think look to mueller for a very, as evan was saying, a