Talarico to face candidate he calls nation's 'most corrupt politician' in U.S. Senate race in TX

Tonight on The Last Word: Ken Paxton defeats Sen. John Cornyn in the Texas GOP primary runoff. Also, the U.S. strikes Iran as Donald Trump says talks are going “nicely.” And Ben Rhodes writes about the battle for American identity in his new book, “All We Say.” Ali Velshi, Texas State Rep. James Talarico, Rep. Adam Smith, and Ben Rhodes join Lawrence O’Donnell.