Ahead of Joe Biden meeting, here's Queen Elizabeth II's history with US Presidents

Imagine trying to make an impression on someone who's met, well, almost everyone. Such is the challenge for US President Joe Biden, who will meet Queen Elizabeth II on Sunday at Windsor Castle outside London. During her nearly 70-year reign, the monarch has met every U.S. president since Dwight Eisenhower, except for Lyndon Johnson, who didn't visit Britain while he was in office. She also met Herbert Hoover, though that was in 1957, more than 20 years after he left the White House.

Her personal ties to U.S. leaders underscore the importance of the United States to the U.K. and to the queen. She came of age during World War II and understands the central role the trans-Atlantic alliance has played in modern British history, said Robert Hardman, author of "Queen of the World,'' which examines her role representing Britain on the world stage.

Biden will be the 13th sitting U.S. president to meet with the now-95-year-old monarch. The latest U.S. president Donald Trump and the queen met in July 2018 in the courtyard of Windsor Castle, outside London, during a visit to Britain for which large anti-Trump protests, including the hoisting of a balloon that depicted Trump in a diaper, were held in the streets of downtown London. Trump largely got around by helicopter to avoid seeing the outpouring against him.

He received a bit of criticism for briefly walking in front of the queen — instead of alongside her — as they reviewed an honor guard on castle grounds. Trump later said he thought of his late mother Mary Anne, who was born in Scotland and who loved the royal family, when he and his wife, Melania, sipped tea with the queen.

Trump's subsequent comment that the queen told him Britain's exit from the European Union, known as Brexit, was complex also created a stir. Most heads of state keep their private conversations with the queen private. She also doesn't discuss political matters.