The Queen last travelled to the USA on an official visit in 2007.
She attended a state dinner at the White House with then-President George W. Bush.
The Queen also reportedly got on well with Bill Clinton, with him giving her high praise in his memoir.
He wrote: “Her Majesty impressed me as someone who but for the circumstance of her birth, might have become a successful politician or diplomat.
“As it was, she had to be both, without quite seeming to be either.”
