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NBC source: Cohen prepared to assert to Mueller Trump knew about 2016 Trump Tower mtg.

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Lawrence talks with fmr. federal prosecutor Mimi Rocah about the potential consequences for President Trump after NBC News source said Trump's fmr. lawyer Michael Cohen is prepared to assert to Robert Mueller that Trump knew in advance of the 2016 meeting with Russians at Trump Tower for dirt on Hillary Clinton. Tim O'Brien and Mieke Eoyang also join.