Tonight on The Last Word: Donald Trump launches his 2024 presidential campaign amid multiple criminal probes. Also, Sen. Mitch McConnell says voters were "frightened" by the "chaos, negativity and excess attacks" within the GOP. Plus, President Biden meets with G7 leaders after an explosion in Poland. And Ukraine President Zelenskyy says the liberation of Kherson is a turning point in the war. Andrew Weissmann, Rep.-elect Dan Goldman, Rep. Matt Cartwright, Peter Alexander, Ben Rhodes and Timothy Snyder join Lawrence O'Donnell.