Democrats demand answers on Elon Musk's access into government agencies. Plus, Donald Trump lies calling Ukraine's Zelenskyy a ‘dictator.' And Donald Trump endorses a GOP plan that could cut Medicaid. Adam Klasfeld, Andrew Weissmann, Sen. Sheldon Whitehouse, and Norm Ornstein join Lawrence O'Donnell.

Donald Trump abruptly fires Joint Chiefs of Staff Chairman CQ Brown. Plus, Kash Patel is sworn in as Trump's new FBI director. Also, Trump attacks Zelenskyy while praising his talks with Putin. And PA State Rep. Mandy Steele warns against Trump's medical research cuts. Jennifer Rubin, Ruth Ben-Ghiat, Rep. Raja Krishnamoorthi, and Michael McFaul also join Ali Velshi.