Tonight on The Last Word: "Trump employee 4" reportedly spoke to investigators after Donald Trump and Walt Nauta were charged by Special Counsel Jack Smith. Also, Fulton County District Attorney Fani Willis says she's "ready to go" on the Trump Georgia election case. And the U.S. will serve as President of the UN Security Council for the month of August. Andrew Weissmann, Bradley Moss, Neal Katyal, Gwen Keyes Fleming and Amb. Linda Thomas-Greenfield join Lawrence O'Donnell.