Tonight on The Last Word: Donald Trump ousts Mike Waltz as national security advisor. Also, Trump nominates “Stop the Steal” organizer Ed Martin for a key prosecutor post. Plus, Trump tariffs are wreaking havoc on U.S. small businesses. And a Trump-appointed judge in Texas rules Trump’s Alien Enemies Act invocation is “unlawful.”  Sen. Adam Schiff and Rick Woldenberg join Lawrence O’Donnell.