Lawrence: Day 150 shows what happens when a madman starts a war

Tonight on The Last Word: Donald Trump fails to explain his strategy 150 days in the Iran war. Also, Democrats eye retaking the Senate with key races now in play. Plus, Trump asks the Supreme Court to let him restrict mail-in voting. And James Comey files a motion to dismiss the seashell indictment. John Kirby, Sen. Mark Kelly, Sen. Alex Padilla, and Sen. Sheldon Whitehouse join Lawrence O’Donnell.