File photo taken on May 24, 2019 shows British Prime Minister Theresa May walking into 10 Downing Street, after announcing her resignation, in London, Britain. Theresa May on June 7 stepped down as leader of Britain's governing Conservative Party, but she will remain as prime minister until her successor is chosen. Her successor as leader, who will become the next prime minister, is expected to be announced by the end of July. (Xinhua/Alberto Pezzali)