know about the prior personal and political connections of donald trump, his family, his businesses and his campaign had with russia. to be able to look where we weren't able to look before, to senator obama deutsche bank, to subpoena the bank records, the cell phone records, the travel records that the republicans wouldn't. don, we ran a take them at their word investigation where they would come in, they would refuse to answer questions, and we weren't able to probe them any further. many times republicans actually told them, you don't have to answer the democratic questions. if you want to get up and leave, you can just leave. that's the investigation we ran. those days are over. we're actually going to do the job to protect our democracy. >> the question is what is your ultimate power in this? i guess what is the outcome here? because you can get these folks back. and i'm not sure if michael cohen is going to tell you anything differently than what he's telling mueller. so what gives here? what's the "end game"? >> mueller can only tell what he knows beyond a reasonable doubt.