Lawrence on the lesson of the Platner campaign: Always wait for the vetting

Tonight on The Last Word: Donald Trump’s war in Iran flares up amid the NATO Summit in Turkey. Also, Democrats pull their endorsements of Graham Platner after a sexual assault claim. And Trump brags about dropping crypto investigations. Rep. Adam Smith, Jessica Mackler, Rep. Chellie Pingree, and Eric Lipton join Lawrence O’Donnell.