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it is the eve of the iowa caucus, the start of the presidential primaries, you may have heard. and i'm ari melber, with you right now for an msnbc special, a candidate slash defendant trump, reporting on his own -- clash of american politics, law, and how voters may assess the candidate, whose ear could end in the exalted oval office, or a small prison cell. that will depend on the outcome of several criminal trials, plus other cases. and -- the next person to track, and break it all down for you tonight on caucus eve, as the primaries begin tomorrow, some of trump's rivals are now i...

President before? that's the question. we've had terrible presidents. we've even had presidents that were corrupt and abuse of power in various ways. but really in the minds of the founders in creating the impeachment procedure, have we had that president? >> the report answer on the evidence is worse than nixon, not as an opinion, not as an assessment, but in the measurable, accountable ways of abusing the levers of power and defying congress. the evidence is here. that's one answer, that is so striking. jacob and emily, thanks to both of you, special guests for special coverage. still ahea...