Boris Johnson promised in his first speech as prime minister to lead Britain out of the European Union on Oct. 31 with "no ifs or buts" and warned that if the European Union refused to negotiate then there would be a no-deal Brexit.

Johnson, who has been hailed by U.S. President Donald Trump as Britain's Trump, is sending the strongest message yet to the EU that he will be taking a distinctly tougher approach to negotiating a revision of the Brexit divorce deal.

He took over from Theresa May at one of the most perilous junctures in post-World War II British history — the United Kingdom is divided over Brexit and weakened by the three-year political crisis that has gripped it since a 2016 referendum vote to leave the bloc.