text:  I'm in this to complete the job I started. He also faced several questions about his confidence in his Vice President, Kamala Harris. What concerns do you have about Vice President Harris's ability to beat Donald Trump if she were at the top of the ticket? Your Vice President, Kamala Harris, would be ready to serve on day one. Can you elaborate on that? What is it about her attributes and her accomplishments over the last four years that make her ready to serve on day one if necessary?