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right now we're watching the manhattan d.a.'s office where we believe a grand jury will hear today from robert costello, a former legal adviser to michael cohen, and heightening the interest today, he's potentially the final act before a decision is made about whether to issue an indictment against donald trump. costello was called in at the request of trump's attorneys, leading many to believe his testimony will be aimed at undermining cohen's credibility. cohen himself is also there, he says, as a rebuttal witness. i want to bring in nbc's garrett haake outside the d.a.'s office. l...

I predict regardless of what costello has to offer. let's face it, the grand jury is a proceeding run by the prosecutors. there's no defense attorney in there, there's no judge in there. prosecuors can usually get to the result they're looking for. let me hasten to add, we're generally looking for a result that is consistent with the evidence that's been presented to the grand jury. i actually think this is a miscalculation by team trump, sending a surrogate in on behalf of donald trump, in essence, trying to undermine the credibility of the chief witness, one of the main witnesses, michael co...

What do republicans need to do to make it a success do you think? >> well, they have a tough row to hoe. it is a proceeding run by the democrats and they don't have much in the way of rights to block that. so they should try to use that to their advantage. they want to show people that adam schiff, who is front and center here, is not really an honest broker. he is a partisan so they want to make him as much of the focus as they can. and most importantly, bill, they want to show that they have an alternative version of events or at least a context in which to understand the activities of presi...