Lawrence: Trump failed his own self-administered cognitive test while Iran's regime was watching

Tonight on The Last Word: Trump pushes the SAVE Act to restrict voting rights. Plus, experts worry that Trump's war could wreck the global economy. And the upcoming "No Kings" protests could see the largest crowds in U.S history. Rep. Hakeem Jeffries, Rep. Brendan Boyle, and Ezra Levin join Lawrence O'Donnell.