Judiciary Chair: Trump AG Barr 'is just a liar'

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President Trump is defying the House Judiciary Committee’s demands, while also appearing to claim Congress should not be in the investigative business. MSNBC Chief Legal Correspondent, Ari Melber, breaks down how the battle lines are forming over whether congressional subpoenas will mean anything in the Trump era. Former New Jersey Senator Robert Torricelli tells Melber the “government will not endure” if Congress “cannot exercise oversight.”