Theresa May set to be UK PM after Andrea Leadsom quits Theresa May is set to become Britain's next Prime Minister, after the other contender, Andrea Leadsom, quit the race early today. It was not immediately clear whether the development meant that Theresa May will automatically become UK's next leader. Ms. Leadsom said Madam May has much wider support among party MPs, and that if she wins the Prime Ministership, she will struggle to unite the party. The ruling Conservative Party has whittled down its candidates from five to two in rounds of votes among MPs, and the wider party of around 150,000 people was set to decide between the two. Prime Minister David Cameron announced his resignation following the June 23, European Union referendum, failing to persuade the British people to remain in the union. SOURCE: CNN