They could be heard in light conversation.

Biden is now the 12th sitting president to meet the Queen during her reign, joining a legacy of American leaders paying their respects to a global icon and living piece of history.

He and first lady Jill Biden met her at Windsor Castle, her home outside London.

"We've just wrapped up what has been an extraordinary and collaborative and productive meeting at the G7," Biden said at a news conference following the G7 and ahead of his meeting with the Queen.

The President said the Queen wanted to know about Russian President Vladimir Putin, whom Biden will meet on Wednesday, and Xi Jinping, the Chinese President.

The Queen served as an Army mechanic in the war.

American presidents often find themselves charmed by the Queen after meeting her.

"The Queen has been a source of inspiration for me, like so many people around the world," President Barack Obama said during a visit to London in 2016, when Prince Philip drove him in a Range Rover from Marine One to the doors of Windsor Castle.

He also quoted the American Declaration of Independence.

The Irish allegiances aside, Biden was unlikely to air his grievances when he sat down with the British monarch on Sunday afternoon.

"Joe and I are both looking forward to meeting the Queen.