Lawrence: The first six Americans killed in Trump's war died because Hegseth left them defenseless

Tonight on The Last Word: Donald Trump threatens Iran by posting an AI image of himself holding a gun. Plus, SCOTUS limits redrawing districts under the Voting Rights Act. And Acting AG Todd Blanche defends his James Comey indictment. Rep. Adam Smith, Eric Holder, and Sen. Sheldon Whitehouse join Lawrence O'Donnell.