john bolton will also end up testifying. all of that is one reason why chairman schiff says they have the key evidence. the courts won't be drawn into a court battle that lasts years. >> we are not willing to allow the white house to engage us in this game, so we press forward. >> is that the right legal strategy? if the white house is hiding really crucial evidence could congress get a faster ruling from the courts? could any of this be considered as an article of obstruction and impeachment itself against president trump? let's get into it. one of the world's leading experts on the constitution, lawrence tribe, who wrote a book on impeachment will tackle those questions and more coming up next. i am the twisting thundercloud.