 I'm Jennifer Kuiper. Pressure is building on President Biden to step aside in the wake of last week's shaky performance during the presidential debate. But Vice President Kamala Harris tells CBS, no way. Joe Biden is our nominee. We beat Trump once and we're going to beat him again. Period. More from CBS's Weijia Zhang. Texas Representative Lloyd Doggett is the first Democratic member of Congress to publicly call for Biden to step down.