bar got another opportunity to debunk the lies. among the claims he focused on were dominion voting machines. >> with the turn of a dial, the change of a chip, you could press a button for trump, and the vote goes to biden. >> i told him that the stuff he was shoveling out to the public was bulshit. but the allegations were made in such a sensational way that they obviously were influencing why people. >> reporter: before the end of december, bar had quit. his replacement? acting attorney general, jeffrey rosen, who came with a blunt, yet low-key acting deputy attorney general, named richard donahue. like barr, rosen and donahue thoroughly investigated each of the fraud claims coming from then president trump. in late december, donahue spoke with the president and told him the truth about numerous false claims, including one involving dominion machines in northern