Michael Cohen has pleaded guilty to lying about his work on Trump Tower in Moscow. Chief Legal Correspondent Ari Melber breaks down the filing, noting it goes further in alleging Trump's family members were "in the loop" and knew about high-level outreach to the Russian Government. Melber also notes: "Mueller has worked expertly on a parallel track with Congress because he's now using the misstatements that people have made to Congress to buttress the Russian side of the collusion investigation"