'Toxic mess': Clash at impeachment trial over what Trump knew

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In this “The Beat Breakdown: Trump on Trial”, MSNBC Chief Legal Correspondent Ari Melber reports the key moments from the Democrats case against Trump, including showing key evidence that aligns with Rep. Adam Schiff’s dramatic closing. Melber also shows how Democrats are arguing Trump obstructed Congress, and the limits of a new Trump defense from Sen. Graham that carries echoes of the sitcom “Seinfeld.” (MSNBC Digital Exclusive.)