Theresa May formally steps down as leader of UK

British Prime Minister Theresa May leaves 10 Downing Street for her last Prime Minister's Questions at the House of Commons in London, Britain, July 24, 2019. Newly-elected Conservative Party leader Boris Johnson took office as the British prime minister on Wednesday amid the rising uncertainties of Brexit. The latest development came after Theresa May formally stepped down as the leader of the country and Johnson was invited by the Queen to form the government. (Xinhua/Han Yan)