Lawrence: Trump's war in Iran shows he doesn't know what he's talking about

Tonight on The Last Word: Democrats excoriate Donald Trump for shifting reasons on the Iran war. Also, MS NOW reports the FBI is losing national security experts in droves. Plus, the FBI subpoenas records from the 2020 election in Arizona. And small businesses sue Trump over his latest global tariffs. Sen. Mark Kelly, Sen. Alex Padilla, Arizona Secretary of State Adrian Fontes, and Rick Woldenberg join Lawrence O’Donnell.