 Days after the ABC appearance, President Biden joined MSNBC's Morning Joe for an audio-only interview, a call-in, telling host Joe Scarborough and Mika Brzezinski that any member of his party that sees him unfit for another term should run against him. But both interviews didn't seem to ease Americans' anxieties. Now, the president's aptitude is being put to the test in front of world leaders as NATO members gather here in Washington, D.C., for a summit to celebrate the alliance's 75th anniversary.