And on the way back from the US, the King will pay a visit to Bermuda.
While Buckingham Palace’s announcement spoke only of a trip in “late April”, President Trump published on social media that the US visit will be 27-30 April, with “a beautiful Banquet Dinner at the White House on the evening of April 28th”.
He said that, along with First Lady Melania Trump, he would “look forward to spending time with the King, whom I greatly respect. It will be TERRIFIC!”
It is also expected that King Charles will deliver an address to Congress.
But sources suggest he is not expected to meet his son Prince Harry, who lives in California, on the other coast to where the King will be meeting President Trump, during a trip which is likely to be tightly packed with official events.
The visit also comes in the wake of Andrew Mountbatten-Windsor’s arrest – and US Congressman Ro Khanna has called for King Charles to meet survivors of the sex offender Jeffrey Epstein.
The brother and sister-in-law of the late Virginia Giuffre echoed the call in a statement given to BBC Newsnight.
Sky and Amanda Roberts said the King’s arrival is scheduled for two days after the anniversary of Guiffre’s death.
“We strongly urge King Charles to meet with us and survivors and hear what we have to say,” they said.
“Amanda and I are hopeful that conversation with survivors and their families will continue to elicit decisive action from the British government against the co-conspirators of Jeffrey Epstein.”
But it is understood the King will not be able to hold such a meeting, because of concerns about jeopardising the ongoing legal processes and police investigations.
Mountbatten-Windsor has always denied any wrongdoing from his links to Epstein.
The US marks its 250th anniversary of independence this year – and that will be a significant focus of the trip, with Buckingham Palace saying the trip will “celebrate the historic connections and the modern bilateral relationship” between the countries.
Shortly before the trip was announced on Tuesday, President Trump lashed out at the UK and other countries over the Iran war, telling them to “go get your own oil” from the Strait of Hormuz and “the USA won’t be there to help you anymore, just like you weren’t there for us”.
