On this week's episode of The Pledge: Rachel Johnson, the prime minister's sister, discusses Boris Johnson's alleged relationship with Jennifer Arcuri, the American model turned technology entrepreneur, who it is claimed was given more than £100,000 in public money when the PM was mayor of London. Femi Oluwole says Mr Johnson's critics need to be careful and not get distracted by focusing on whether or not Mr Johnson had an affair with Ms Arcuri. Also, are Extinction Rebellion's goals realistic? Carole Malone and Andrew Pierce argue that Extinction Rebellion's goals cannot be achieved by 2025 without severe limitations on air travel and car usage.