MSNBC's Ari Melber hosts "The Beat" on Monday, February 26 and reports on warning signs for Trump's campaign as more Republicans say they won't back him if he's the nominee in November. Plus, "Curb Your Enthusiasm" star JB Smoove and Sherri Shepherd join for a special Fallback!

MSNBC's Ari Melber hosts "The Beat" on Wednesday, February 28, and reports on the Supreme Court deciding to hear Trump's immunity case and Mitch McConnell's resignation from GOP leadership. Andrew Weissmann, Neal Katyal, Michael Steele and Elie Mystal join to discuss. Plus, "Curb Your Enthusiasm" actress Susie Essman joins Melber to remember co-star and comedian Richard Lewis.