 NBC News. I'm Michelle Franzen. The first presidential debate raising more concerns over age. President Biden appearing to stumble several times last night while answering questions. The president at a rally today in Raleigh says he's not the youngest, but says his opponent, Donald Trump, is just three years younger. The president says he also knows how to tell the truth, taking a jab at Trump, who made false claims last night on several issues. The Biden campaign communications director, Michael Tyler, meantime, doing damage control following the debate.