text:  Live from NPR News in Washington, I'm Corva Coleman. President Biden is scheduled to hold a solo press conference late this afternoon in Washington. It comes at the end of this week's NATO summit. Biden's remarks will be closely watched following last month's disastrous debate performance. Some congressional Democrats have asked him to leave the presidential race. That now includes Vermont Democratic Senator Peter Welch. Former House Speaker Nancy Pelosi said that while it's up to Biden to decide whether to run,