 I'm Meghna Chakrabarty. Join me weekdays at 1 for On Point on NPR News. The show unites distinct and provocative voices with passionate discussion of the stories that are at the center of what's important in the world today. President Biden faces continued criticism for his age and acuity, but what would it take to actually unseat the presumptive Democratic nominee before the fall election? Who would step up? I'm Kathy Werzer. It's Tuesday, July 2nd, and it's Morning Edition.