Boris Johnson, the ebullient Brexiteer who has promised to lead Britain out of the European Union with or without a deal by Halloween, will replace Theresa May as prime minister after winning the leadership of the Conservative Party on Tuesday.

His victory catapults the United Kingdom towards a Brexit showdown with the EU and towards a constitutional crisis at home, as British lawmakers have vowed to bring down any government that tries to leave the bloc without a divorce deal.

Johnson, the face of the 2016 Brexit referendum, won the votes of 92,153 members of the Conservative party, to 46,656 for his rival, Foreign Secretary Jeremy Hunt.

Boris Johnson, the ebullient Brexiteer who has promised to lead Britain out of the European Union with or without a deal by Halloween, will replace Theresa May as prime minister after winning the leadership of the Conservative Party on Tuesday.

His victory catapults the United Kingdom towards a Brexit showdown with the EU and towards a constitutional crisis at home, as British lawmakers have vowed to bring down any government that tries to leave the bloc without a divorce deal.

Johnson, the face of the 2016 Brexit referendum, won the votes of 92,153 members of the Conservative party, to 46,656 for his rival, Foreign Secretary Jeremy Hunt.