Stocks tumble as Donald Trump attacks Federal Reserve Chair Jerome Powell. Also, Harvard University sues the Trump administration over funding cut threats. Plus, Defense Secretary Pete Hegseth reportedly shared sensitive information on Yemen strikes in a Signal chat with his wife and brother. And Pope Frances dies at 88 after a stroke. Sen. Sheldon Whitehouse, Laurence Tribe, Sen. Mark Kelly, and Sister Simone Campbell join Lawrence O'Donnell.

Donald Trump's tariff uncertainty causes price spikes and layoffs. Also, Elon Musk and Treasury Secretary Scott Bessent reportedly have a verbal brawl in the West Wing. Plus, a federal judge slams the Trump administration's "bad faith" in Kilmar Abrego Garcia's case. And the president of Harvard University speaks out about Trump's attack. Sen. Jon Ossoff, Jen Psaki, and Sen. Chris Van Hollen join Lawrence O'Donnell.