LONDON (AP) - Imagine trying to make an impression on someone who's met, well, almost everyone.
Such is the challenge for President Joe Biden, who is set to sip tea with Queen Elizabeth II on Sunday at Windsor Castle after a Group of Seven leaders' summit in southwestern England.
Biden, accompanied by wife, Jill, became the 13th president to meet the monarch, making her acquaintance Friday night at a reception at an indoor rainforest she and other royals held for leaders attending a summit in Cornwall of the world's seven largest economies.
The White House said Biden met the queen in 1982, but that was when he was a U.S. senator.
The now-95-year-old monarch has met every American president since Dwight Eisenhower during her nearly 70-year reign, except for Lyndon Johnson, who didn't visit Britain while he was in office.
She was a 25-year-old princess when she came to Washington in 1951 and stayed with President Harry S. Truman and his family at Blair House, where Truman lived while the White House underwent a major renovation. She met Herbert Hoover in 1957, more than 20 years after he left office.
Her personal ties to U.S. leaders underscore the importance of the United States to the United Kingdom 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.
"She grew up with that sort of sense of the USA is almost a sort of salvation that came along and rescued Europe in the darkest days of the war," Hardman told The Associated Press.
Here are highlights of some of her meetingswith past American presidents:
Donald Trump
Trump and the queen met in July 2018 at Windsor Castle during a visit to Britain that drew large anti-Trump protests in downtown London.
He was criticized for breaking protocol by briefly walking in front of the queen - instead of alongside her - and turning his back on her as they reviewed an honor guard.
Barack Obama
Obama and the queen had their first of three meetings in April 2009 at a reception for world leaders attending the Group of 20 nations summit in London.
It was there that first lady Michelle Obama broke protocol by briefly putting an arm around the queen's back as they commiserated about their achy feet. It's generally a no-no to touch the queen, but she returned Mrs. Obama's gesture.
George W. Bush
Bush detested stuffy, formal affairs, but he donned a white tie-and-tails tuxedo after the queen pulled out all the stops for a state dinner in his honor at Buckingham Palace in November 2003.
Stumbling on a line in his speech, Bush said the queen had dined with several of his predecessors and had helped the United States "celebrate its bicentennial in 17- " Bush caught himself and corrected the date to 1976, and paused to see if she had taken offense.
"She gave me a look that only a mother could give a child," Bush said with a smile.
George H.W. Bush
One of the more memorable images from the monarch's third state visit to the U.S. came in 1991 when only her white-striped purple hat could be seen above the microphones when she spoke at an arrival ceremony on the White House grounds.
Someone forgot to adjust the lectern after the much taller Bush spoke.
The queen stayed strong and carried on, later making light of the incident as she opened an address to a joint meeting of Congress.
"I do hope you can see me today from where you are," she deadpanned. Bush later apologized.
Ronald Reagan
Reagan and the queen bonded over their mutual love of horseback riding.
They rode side by side on an 8-mile, hourlong tour on the grounds of Windsor Castle when Reagan visited her there in June 1982. Reagan was the first president to sleep over at the British royal family's historic home, an 11th-century estate overlook the River Thames.
While in the U.S. in 1983, the monarch and Philip stayed with the president and first lady Nancy Reagan at their ranch in Santa Barbara, California.
She wanted to ride horses again, but a rainstorm wouldn't allow it.
The Reagans served a lunch of regional staples, including enchiladas, chiles rellenos, refried beans, tacos, rice and guacamole.
They also hosted a state dinner for the queen in San Francisco at the M.H. de Young Memorial Museum.
JIMMY CARTER
The queen hosted Carter in May 1977 on his first overseas trip at a dinner for NATO leaders at Buckingham Palace. At one point, as Carter stood with the queen and other guests, he noticed the arrival of the queen mother.
Ever the Southern gentleman, Carter broke away, took her by the hand and escorted her to the assembled line of guests.
The no-frills Georgia peanut farmer-turned-president ate chicken mousse off a gold plate and seemed excited by his dinner seating between the queen and her sister, Princess Margaret, and across from her son, Prince Charles, Prince Philip and the queen mother.
GERALD FORD
Ford threw a gala state dinner for the Brits in 1976 to mark the bicentennial of the American Revolution. The queen was resplendent in a diamond-studded tiara that sparkled for a crowd that included diplomats, star athletes and celebrities such as Cary Grant and Julie Harris.
The mood evaporated when Ford led the queen to the dance floor while the song "The Lady Is a Tramp" echoed throughout the State Dining Room.
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Superville reported from Washington. AP news researcher Jennifer Farrar in New York and Associated Press writer Nancy Benac in Washington contributed to this report.