Ethnic minorities account for about 13% of the U.K. population but only 8.5% of the Royal Household staff.
The 95-year-old queen, a keen racing fan and racehorse owner, has attended Ascot almost every year of her seven-decade reign.
Biden, who is in the U.K. for the Group of Seven leaders summit, is the 13th American president to meet the monarch.
During the first overseas trip of his presidency, Joe Biden will meet with Queen Elizabeth at Windsor Castle.
The queen's youngest son said royals have all dealt with intrusion and attention "in slightly different ways."
The Queen marked what would have been her husband's 100th birthday with the planting of the Duke of Edinburgh Rose.
Graduate students' decision to take down the photo of Queen Elizabeth drew outrage from some and cries of "cancel culture."
A rep for the Duke and Duchess of Sussex contradicted a BBC report that Queen Elizabeth wasn't asked about using the family name Lilibet for the baby royal.
Biden and the queen will meet face-to-face after the president's G7 summit.
The Guardian uncovered new documents that show the palace continued the practice until the late 1960s.