The Bidens paid their respects to the queen as she lay in state in London.
The coffin of Queen Elizabeth II is being viewed by people in London.
The first lady and the U.S. ambassador to the U.K. stood silently with Biden and his hand over his heart as he made the sign of the cross.
Biden told reporters after visiting the coffin that the queen was decent, honorable, and all about service, and even in private reflected the image she'd portrayed in her 70 years on the throne.
The president was among thousands of mourners who have streamed past the coffin in recent days.
Olena Zelenska, the wife of Ukrainian President Volodymyr Zelensky, visited the coffin on behalf of her country after meeting with Prince William's wife.
European Commission President Ursula von der Leyen, Japanese Emperor Naruhito, King Felipe VI of Spain, and Queen Letizia of Spain were all photographed arriving at Buckingham Palace for a diplomatic reception hosted by the new monarch King Charles III.
The coffin of the queen is lying in state.
Biden is in London.
Trudeau and his wife arrived at the house.
The French president and his wife stood silently as they paid respects.
The First Lady of Ukraine, Olena Zelenska, is pictured with the Ukrainian Ambassador to the UK.
The coffin of Queen Elizabeth II was passed on by the President of Ireland and his spouse.
The president and his wife arrived to pay their respects to the queen.
Thousands of people lined up for hours over the weekend to view the queen's coffin at the oldest part of the Houses of Parliament. David Beckham was one of the celebrities who waited hours to pay respects. Thousands of people are expected to attend the state funeral of the queen at the abbey.