Boris Johnson set to become next UK PM as Conservatives announce new leader

Boris Johnson, a leadership candidate for Britain's Conservative Party, leaves his office in London, Britain. [Reuters]

Boris Johnson is expected to be elected leader of Britain’s governing Conservative Party and the country’s next prime minister on Tuesday, tasked with following through on his “do or die” pledge to deliver Brexit in just over three months time.

Johnson and his rival, Foreign Secretary Jeremy Hunt, have spent the last month crisscrossing the country seeking to win over the less than 200,000 Conservative Party members who will choose Britain’s new leader.