President Trump has revealed that Barack Obama left a letter for him in the Oval Office, but says he will not be divulging its contents to the media.

Speaking at a swearing-in ceremony for senior White House staff, Donald Trump said: "It was really very nice of him to do that and we will cherish that, we will keep that and we won't even tell the press what's in that letter."

The new US president also discussed planned meetings with fellow world leaders, starting with Theresa May.

"We are going to tell you that this has been a very interesting few days, we have set up meetings with the Prime Minister of the United Kingdom and Prime Minister May will be coming over to the United States shortly," he said.