 Live from NPR News in Culver City, California, I'm Dwayne Brown. President Biden and former President Trump face off tonight, marking the first time a sitting president is debating a former one. The unprecedented rematch features the two oldest candidates ever to compete for the White House, with one now a convicted felon. Both campaigns out today, though, with fresh attack ads. The Trump campaign questioning Biden's mental fitness, and the Biden campaign calling Trump a threat to democracy.