Harris says "Joe Biden is our nominee" in response to lawmaker's call for him to step aside

Vice President Kamala Harris immediately pushed back on the idea that President Joe Biden should step aside, after Democratic Rep. Lloyd Doggett of Texas called on him to leave the race in the wake of his unsteady debate performance last week.

"Look, Joe Biden is our nominee," she said in an exclusive interview with CBS News. "We beat Trump once, and we're going to beat him again, period."

Harris said she's "proud to be Joe Biden's running mate" and declined to directly answer a question about whether she's ready to lead the country if necessary.