On Wednesday, Mr Richie spoke during an event in New York among a host of celebrity supporters of the King’s Trust who joined its founder and the Queen to celebrate the charity’s work and showcase the UK’s cultural impact. He described the monarch as a wise friend “giving advice as to what we should be doing”.

Richie, the first global ambassador and chairman of the Global Ambassador Group for the King’s Trust, said about Charles’ address on Tuesday on Capitol Hill: “I thought it was brilliant and how he threaded the needle – so brilliant, but brought us back into humanity as only he can do

“A friend, giving advice as to what we should be doing, a wise friend.”

Charles has been praised for his speech, which outlined the issues, values and priorities important to the UK and many of its allies, from support for Ukraine to the threat to the environment and the importance of the rule of law.

The New York Times said: “Beneath King Charles’s jokes and decorum, some subtle rebuttals to Trump, King Charles III gently pushed back against President Trump’s attacks on Britain and Nato, and he spoke of the importance of checks and balances.”

During the reception at Christie’s auction house, Charles began by making the audience laugh when he told them: “I hesitate to make another speech because I may have had enough”.

The monarch joked “as we look to the future, I won’t see the long-distance future” and he urged those in the room to “champion the next generation”.

Charles and Camilla will end their four-day state visit, the King’s first trip to the US as monarch, today by marking the 250th anniversary of US independence and visiting Virginia.