How much has the Williamson row damaged Rishi Sunak?

<div>Though Gavin Williamson has now resigned, Rishi Sunak still had to fend off a number of questions on the disgraced minister at today's Prime Minister's Questions. How much damage has the row done to the Prime Minister? Cindy Yu talks to James Forsyth and Isabel Hardman.<br> <br> Produced by Cindy Yu.</div>