The favourite to become the next Prime Minister Boris Johnson was heckled during a hustings event. It followed a question about Britain's ambassador to the United States, Kim Darroch, who resigned in a furore over leaked memos. Darroch quit after Donald Trump labelled him "stupid" and "wacky" following the leaking of the memos in which he branded the U.S. president's administration inept. Johnson, a former foreign minister, repeatedly failed to back Darroch during a previous televised debate. From Brexit breaking news to HD movie trailers, The Sun newspaper brings you the latest news videos and explainers from the UK and around the world. Become a Sun Subscriber and hit the bell to be the first to know Read The Sun: http://www.thesun.co.uk Like The Sun on Facebook: https://www.facebook.com/thesun/ Follow The Sun on Twitter: https://twitter.com/TheSun Subscribe to The Sun on Snapchat: https://www.snapchat.com/discover/The_Sun/1633225139