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What does Michael Cohen know?

08:35

The president’s former lawyer and personal fixer, Michael Cohen, is on Capitol Hill for the first of three days of testimony. Watch Ali Velshi and Stephanie Ruhle break down what the next few days will look like for Cohen and what he knows about President Trump. Weighing in: NBC’s Garrett Haake and former federal prosecutor for the Southern District of New York, Berit Berger.