very sophisticated, multi-part plan overseen by donald trump to attempt to overturn the election. no president in our history has ever done anything close to that before. >> reporter: vice chair, liz cheney, one of two republicans on the committee, has spent the last year bucking her party, and helping investigate donald trump fc sophisticated multipart plan. the first piece the committee focused on where the lies. >> mail ballots are a very dangerous thing for this country, because they are cheaters. >> reporter: in the lead up to the election, donald trump had been talking about the possibility of widespread voter fraud by months. >> voter mail is fraught with fraud, people steal them out of mailboxes. >> looking back, it is clear he was laying the groundwork for this. >> this is a fraud on the american public. this is an embarrassment to our country. we were getting ready to win this election. frankly, we did win this