on the very last day they were permitted to under the court order, sort of in the dark night on the friday before christmas. so this was not information the government wanted to turn over, and it's aggressively redacted. it makes you think of the mueller report as you look through it with these large blocks of black. there is a lot more here that we don't know yet. >> yet there were key pieces of information that are quite valuable, including this email from duffey to the defense department. we had heard anecdotely about this from mark sandy. obviously impeachment is not a traditional legal proceeding, but you have had 25 years as a prosecutor. what would you do? how do you handle this if new evidence comes to light in the midst of a case or a trial? >> well, you need to hear the evidence. this just isn't a matter of politics. this is a matter of the search for the truth, which is what a process like a criminal trial or impeachment is about.