The former London mayor won the contest to succeed Theresa May on Tuesday by securing the leadership of the Conservative Party in a campaign that put the United Kingdom on course for a showdown with the European Union.

Johnson’s cabinet choices will help to flesh out how he intends to manage the world’s fifth-largest economy and its divorce from the EU at one of the most fateful moments in its modern history. Johnson has pledged to negotiate a new divorce deal with the EU to secure a smooth transition. But if the bloc continues to refuse to renegotiate, he has promised to leave anyway - “do or die” - on the current agreed date of Oct. 31 - Halloween.