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wolf blitzers on assignment. im alex marquart, and youre in "the situation room." and first up tonight, our exclusive report on a federal criminal investigation into former president donald trump. attorneys for the former president unable now to locate a classified document that he referenced on an audiotape now in possession of prosecutors. kaitlan collins is on the team that broke the story and has the latest. take us through what we know. >> reporter: what happened is mario martin...

Three national polls or early state polls, a minimum of 40,000 unique donors to their campaign, and they have to sign a pledge to support the eventual republican nominee. what do you make of those terms? >> well, it seems to me this is a pretty high bar, not so high that it cant be reached by a lot of people. but it starts the process by the rnc saying we only want serious competitors who are building an operation and building a campaign and having some recognition already with voters on the deb...