Battle to become UK prime minister

Boris Johnson, a leadership candidate for Britain's Conservative Party, holds a battering ram as he visits the Thames Valley Police Training Centre in Reading, Britain, July 3, 2019

Jeremy Hunt, a leadership candidate for Britain's Conservative Party, delivers a speech on his Brexit plan, in London, Britain, July 1

Boris Johnson, a leadership candidate for Britain's Conservative Party, reacts as he visits the Thames Valley Police Training Centre in Reading, Britain, July 3

Jeremy Hunt, a leadership candidate for Britain's Conservative Party, speaks during a hustings event in Belfast, Northern Ireland, July 2

Boris Johnson, a leadership candidate for Britain's Conservative Party, holds a method of entry equipment as he visits the Thames Valley Police Training Centre in Reading, Britain, July 3

Conservative Party leadership candidate Boris Johnson gestures as he talks during the launch of his campaign in London, Britain June 12

Jeremy Hunt, a leadership candidate for Britain's Conservative Party, leaves BBC studios in London, Britain June 30

Britain's Foreign Secretary Jeremy Hunt speaks during the launch of his campaign for the Conservative Party leadership, in London, Britain June 10

Boris Johnson and Jeremy Hunt appear on BBC TV's debate with candidates vying to replace British PM Theresa May, in London, Britain June 18