Tonight on The Last Word: Donald Trump accuses Special Counsel Jack Smith of political bias in a new filing. Also, Trump is in court for the second E. Jean Carroll defamation case. Plus, Trump wins the Iowa caucus with the lowest turnout in decades. And Youngstown State University hires election denier GOP Rep. Bill Johnson as president. Andrew Weissmann, Bradley Moss, Faith Gay, Simon Rosenberg, and Ed O'Neill join Lawrence O'Donnell.