Watch: How Dems are building the impeachment case against Trump

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As Donald Trump’s chief of staff admits Trump tried to collude with the Russians, Democrats question key impeachment witnesses behind closed doors. It’s a lesson they may have learned from Watergate investigators, who drafted impeachment articles out of public view. In this discussion on MSNBC’s impeachment special hosted by Ari Melber, former federal prosecutor Berit Berger, former federal judge Nancy Gertner and former Senator Barbara Boxer weigh the strengths of the Democrats’ case.