Harris says she and Biden "will win reelection" and is prepared to step into role of president "if necessary"

Vice President Kamala Harris told CBS News that she and President Biden will secure a second term in office, even amid Republican criticism and concerns among some Democrats about the president's age.

"We will win reelection. There's too much at stake and the American people know it," Harris told CBS News "Face the Nation" moderator and chief foreign affairs correspondent Margaret Brennan.

With Harris being 58 and Biden seeking to win next year's election just before he turns 82, Harris said she is ready to assume the role of commander in chief "if necessary," but believes Biden "is going to be fine."