Four GOP senators vote against Donald Trump's Canada tariffs. Also, Sen. Cory Booker's 25-hour Senate speech gave Democrats a voice of resistance against the Trump administration. Plus, Michigan Democrat Mallory McMorrow enters the U.S. Senate race. And the Trump-Musk cuts to USAID intensifies the humanitarian crisis in Sudan. Sen. Amy Klobuchar, MI State Sen. Mallory McMorrow, and Declan Walsh join Lawrence O'Donnell.

Trump tariffs drive the stock market down 2,200 points. Also, Senate GOP and Democrats introduce a bill to limit Trump tariffs. Plus, Donald Trump fires the head of the NSA after meeting with 9/11 conspiracy theorist Laura Loomer. And former President Obama speaks about the Trump 2.0 era. Sen. Chuck Schumer, Sen. Elizabeth Warren, and Sen. Mark Warner join Lawrence O'Donnell.