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rebuttal witness on monday >> now, this morning i receive a whole slew of phone calls, from journalists asking me i i'm going to be back to th da's office tomorrow, as a rebuttal witness to whoever it is that they're bringing they're tomorrow whether it' before the grand jury or it' just to meet with them for a interview i'm not sure but, ye i was asked to make myself available. >> the witness michael cohen's rebutting, nbc news ha confirmed that attorney, bob costello, who was once a legal adviser to michael cohen wil testify on monday before the grand jury looking into th 2016 hush...

da that and the critical election case that could drasticall affect your voting rights, and it's all thanks to a republica gerrymander in north carolina. i'm ayman, let's get started >> there's a lot of new news tonight and the trump manhatta da investigation today on - michael cohen said he has been asked by the manhattan da' office to serve as a rebutta witness on monday. >> so, this morning i di receive a whole slew of phon calls from journalists, asking me if i'm going to be back t the da's office tomorrow as a rebuttal witness to whoever it is that they're bringing their tomorro...

Representing him in th southern district of new york' ukraine investigation. that's the investigation tha stems from our both, france -- , so his involvement like trum world, we haven't even got t bannon in the contempt o congress case. it's just so deep, long-standing, that hi credibility could be easil tarnished to for donald trump to take t social today and call bo costello, the most important witness in this case it's borderline laughable, given that he has his ow incentive structure here and it has nothing to do wit solely telling the truth about michael cohen. >> what would you say to cr...

Lisa rubin, and msnbc lega honest, david cay johnston visiting lecturer at college o law, and glenn kirschner former federal prosecutor an msnbc legal analyst. great to have all three of you with us. glenn, let start with you. first, let me get your reactio to this news we got today. about tomorrow's grandeu schedule, michael cohe standing as a rebuttal witness for bob costello who's also cohen's forme lawyer how do you see that playing out? what's at play here? >> it doesn't surprise me, ayman, that they may b inviting michael cohen back to shed some light on what bo costello said. at one poi...

Represented steve bannon how do you see - impacting this case in new york? >> i think, going back to what glenn said, if our prosecutor, and i got the opportunity to take bob castella's testimon tomorrow, i would certainl exploit the fact that bo costello is enmeshed in trum world eight ways from sunday he's a longtime associate firm rudy giuliani. as we mentioned, he' represented giuliani not onl in the ongoing fulton county investigation, but als represented him in the souther district of new york's ukraine investigation. that's the investigation tha -- and slow, his involvement with trump w...