US President Donald Trump says Brexit Party leader Nigel Farage and new UK Prime Minister Boris Johnson will do "tremendous things" together, during a speech to a right-wing youth organisation in Washington DC.

Boris Johnson will take office on Wednesday afternoon after winning a decisive victory over Foreign Secretary Jeremy Hunt in a ballot of Tory members - gaining a 66.4% total share of the vote.

The ex-mayor of London is expected to address the nation for the first time outside Downing Street at about 16:00 BST after accepting the Queen's invitation to form a government.

That will follow Theresa May formally giving her resignation as prime minister at Buckingham Palace.