Tonight on the Last Word: Some senators want to hear more from Lev Parnas after his revealing interview with Rachel Maddow. Also, Harvard Law Professor Laurence Tribe talks to Lawrence about his former student John Roberts. Plus, presidential candidate Sen. Amy Klobuchar looks ahead to the impeachment trial after being sworn in as a juror. And Lev Parnas claims Trump wanted the U.S. Ambassador to Ukraine fired a year before she was actually fired. John Heilemann, Joyce Vance, Matt Miller and Ned Price also join Lawrence O’Donnell.