US President Donald Trump has been invited for a second state visit by the King.

Prime Minister Sir Keir Starmer used his trip to the White House to present Trump with an invitation letter from King Charles.

Sir Keir said the president’s last state visit in 2019 had been a “tremendous success” and that the invite for a second visit was “truly historic” and “unprecedented”.

Speaking to reporters in the Oval Office after reading the letter, Trump said he accepted the invite and that it would be an “honour” to visit the “fantastic” country.

He added that King Charles was a “beautiful man, a wonderful man”.

Traditionally second-term US presidents are not offered a state visit and have instead been offered tea or lunch with the monarch at Windsor Castle.

King Charles’ letter, which Trump showed to the cameras, read: “Quite apart from this presenting an opportunity to discuss a wide range of issues of mutual interest, it would also offer a valuable chance to plan a historic second state visit to the United Kingdom.

“As you will know this is unprecedented by a US President. That is why I would find it helpful for us to be able to discuss, together, a range of options for location and programme content.

“In so doing, working together, I know we will further enhance the special relationship between our two countries of which we are both so proud.”

The letter proposed meeting in Scotland at either Dumfries House or Balmoral.

Trump joked that he would have to check if the signature was real.

Sir Keir gave Trump the letter as the two leaders took questions from reporters ahead of talks expected to cover topics including the war in Ukraine.

Speaking on the plane to the US, Sir Keir told reporters that a peace deal would not stop Vladimir Putin from invading Ukraine again, unless the US were able to provide security guarantees.

Asked if the US could provide such support, Trump said a proposed deal with Ukraine over access to critical minerals would provide “a backstop”.

“We are a backstop because we will be over there, we will be working in the country,” he said.

Pressed over whether he would approve the UK’s potential deal to hand over the Chagos Islands to Mauritius, Trump said: “We’re going to have some discussions about that very soon, and I have a feeling it’s going to work out very well.

“I think we’ll be inclined to go along with your country,”

In an interview before travelling to the US, Foreign Secretary David Lammy said the controversial deal would not go ahead unless the US supported it.