block certification of the to 20 election result. the committee investigating the insurrection will hold public hearings soon and they have firsthand knowledge of then president trump's actions during the siege on the capitol. the committee's vice chair liz cheney gave this preview sunday. >> the committee has firsthand testimony now that he was sitting in the dining room next to the oval office watching the attack on television as the assault on the capitol occurred. we know members of his family, we know his daughter, firsthand testimony that his daughter ivanka went in at least twice to ask him to please stop this violence. >> cnn's special correspondent jamie gangel is joining with us more details. liz cheney says the committee has firsthand knowledge of what the former president was doing. walk us through what we know. >> so, first of all, this is bad news for donald trump because firsthand testimony is someone in the rom, firsthand. now what we've learned is in