UK Prime Minister Boris Johnson has resigned from his post within three years of walking into 10 Downing Street after a record number of resignations from his ministers. He will stay on as caretaker prime minister until October, with a new Conservative leader set to be installed in time for the party’s annual conference. Johnson is a controversial figure in British politics. Supporters have praised him as humorous, witty and entertaining, with an appeal stretching beyond traditional Conservative voters. Under Britain’s political rules, the next election must be called by December 2024, with election day five weeks later.