 We'll be on President Biden when he takes questions from the White House press corps later today. The president will try to quiet doubts about his ability to serve another four years when he holds a rare solo press conference. It comes at a critical moment for his reelection campaign as Democrats remain uneasy about him being on the ticket after his wobbly debate performance two weeks ago. White House correspondent Greg Clugston, the press conference at 630 p.m. Eastern.