King Charles and Prince William could visit the U.S. next year to mark the 250th anniversary of the Declaration of Independence and boost relations with Donald Trump, who has frequently spoken of his admiration and respect for the British monarchy.

It is understood that the personal message reflected the enduring special relationship between the UK and the US.

The King has sent a personal message of congratulations to Donald Trump on his inauguration, reflecting on the enduring special relationship between the UK and US, Buckingham Palace said. Charles’s private written words were delivered to mark Mr Trump being sworn into office as US president for a second time.