Mark Halperin breaks down Biden’s cancer diagnosis announcement and why the timing of it raises serious red flags. Mark explains the reasons why the Bidens can’t be trusted and warns that the media coverage since the announcement shows signs the press is already slipping back into the bad habit that cost them their credibility: the media’s mistaken belief that the Bidens don’t lie – even now. Plus, Joe Scarborough and Mark Halperin take their years-long private debate public for the first time on "Next Up." Scarborough details what led him to making the “best Biden ever” viral comment, and why he still believes Biden’s “bad days” didn’t mean he was incapable of governing.