>> i'm jake tapper. aides say this second hearing will drill down on evidence that president trump knew he lost the election but spread false claims of fraud anyway, ignoring court rulings, ignoring the will of the american people. lead-off witness, bill stepien, who has firsthand knowledge about what trump knew about the election numbers. stepien tells cnn he is appearing under subpoena. also testifying today, former fox digital content director chris stirewalt. he was fired after his accurate call of arizona for joe biden. we'll hear directly from republicans who investigated and rejected claims of election fraud in the key states of georgia and pennsylvania, and felt trump's anger for it, former u.s. attorney bijay . . ak and al schmidt and ben ginsburg will testify there was no widespread fraud in 2020 and