Doris Kearns Goodwin on Divisiveness in the 1850s and Now

With Democrats hoping to vote on articles of impeachment before Christmas, the political temperature in the U.S. looks set to keep rising. They say the evidence of serious presidential misconduct is overwhelming, but President Trump’s defenders are only digging in, responding with conspiracy theories, disinformation and distortion. Doris Kearns Goodwin joins Christiane in New York to discuss.