americans think it is a gross abuse of power and the constitution. >> when you do hear from kurt volker, the former special envoy to ukraine, he's still planning to appear at this deposition despite the letter from pompeo, i know there is a lot, you just talked about what you wanted to learn, how forthcoming do you think he's going to be as a witness? >> i think it is in his interest to be as forthcoming as possible to save his own reputation, career and to avoid criminal exposure. the question he has to answer to the american people is why was he subverting the process, why is he allowing the president's personal lawyer to have meetings with senior advisers to the president of ukraine? we have these processes for a reason. and that is because we have a president of the united states, not a king. these processes are to check any president's power. and here you have allegations that the envoy was subverting all of the processes and he owes the american people an