The US State Department has said it is looking forward to working with newly-appointed foreign secretary Boris Johnson.
The US will always be able to work with British officials because of its "deep, abiding" relationship with Britain, State Department spokesman Mark Toner said at a press conference.
David Cameron has led the Conservative party "magnificently", Boris Johnson said.
The former London Mayor said: "I think it has been a fantastically distinguished period of government. I think he's led our party magnificently."
He added: "He will be remembered as a great reforming prime minister."
Boris Johnson has congratulated Theresa May and Andrea Leadsom, saying that as a result of two women competing for the top title, the Conservatives are "the most progressive party in Britain".
He also said Leadsom's position in particular was a "stunning achievement".
His full statement:
Many Congratulations to both Andrea and Theresa.
For the second time in history the conservatives will have a female prime minster, proving that we are the not just the greatest but the most progressive party in Britain.
I want to offer particular congratulations to Andrea Leadsom on her stunning achievement.
She is now well placed to win and replace the absurd gloom in some quarters with a positive confident and optimistic approach, not just to Europe, but to government all round.
Rachel Johnson has accused Michael Gove of executing the biggest "act of treachery in modern political history".Read the full story ›
Boris Johnson has been heckled as he left his home in London over the EU referendum and his decision not to take part in the contest for next leader of the Conservative party.
The heckler accused him of putting his own interests before the country but not "having the guts to sort it out".
Mr Johnson dismissed the claims as "rubbish".
Asked by a journalist if he felt betrayed by Michael Gove, Mr Johnson said: "I cannot, unfortunately, get on with doing what I wanted to do, so it'll be up to somebody else now."
He added: "I wish him every possible success".
Asked whether he had "betrayed Boris", Conservative leadership candidate, Michael Gove, dodged the question.
Instead the Justice Secretary said that he will be giving a speech at 11am on Friday morning.
In an email accidentally sent to a member of the public, Mr Gove's wife Sarah lays out some instructions for what he should do next.Read the full story ›