Tonight on The Last Word: Mary Trump says her uncle, Donald Trump, is "quite simply, a loser." Also, Donald Trump's legal bills are hurting his campaign finances. Plus, Republicans tank a border deal after pressure from Trump. And Alexei Navalny's mother accuses Russian officials of forcing her to have a secret funeral. Mary Trump, Andrew Weissmann, Barbara McQuade, Simon Rosenberg, and Timothy Snyder join Lawrence O'Donnell.