So far, most polls of Tory members show that they'd prefer Liz Truss to Rishi Sunak when it comes to the next Conservative party leader. With ballots for the membership phase going out at the beginning of August, it's vitally important for Sunak to break through to members as soon as possible. Can he catch up? Katy Balls talks to James Forsyth and Fraser Nelson.

Produced by Cindy Yu.