the ukrainian energy giant burisma where biden reportedly earned $50,000 a month. they also want information about any money biden or his various investment firms gained from china. biden's position on the board of burisma is partially what led to the democrats impeachment case. last month the former polish president who is on the board of burisma as well said biden was indeed placed on the board because of his last name. but for former vice president joe biden, burisma is a sore spot. watch. >> what's your understanding of what son was doing for an extraordinary amount of money? >> i don't know what he was doing. i know he was on the board. i found out he was on the board after he was on the board and that was it and there's nobody -- >> not a lot of time, isn't there something you want to get to the bottom of? >> no. i trust my son. if you want to talk about problems, let's talk about trump's family. come on. >> after separating from his