 Can he reassure voters? Would you be willing to have the independent medical evaluation? Quell the panic in his own party. Do you really believe you're not behind right now? This morning, our exclusive interview with President Joe Biden, plus our powerhouse roundtable. We use speed, surprise, and violence of action to divert, suppress, and neutralize that threat. Ahead of the political conventions, Pierre Thomas looks at the efforts to secure the events. Secret Service Director Kim Cheadle joins us live.