and that is what was his intention shown by both his action and reactions to what his daughter was saying. so this is important testimony if they can get it. >> they also say, john, that trump's attacks on pence riled up that mob. they want to know what was going on inside the white house when he tweeted that mike pence didn't have the courage to do what should have been done to overturn the election. what doubts are they looking to connect here, do you think? >> well, i think they're looking to connect how hard the president pressed trump or pressed his vice president. we know we have from other sources that it was a pretty hard press. and they'd like to hear from ivanka what she thought of all that. it was very unseemly. how unconstitutional did she know it was? i think that was implicit in the letter also they have a lot of information on what was discussed in the office, the issue of whether the white house counsel had told the president