During the summit in Cornwall on Friday (June 11th), a convoy of US presidents rushed to the dinner reception.
But he arrived with First Lady Jill Biden a few minutes after the Queen arrived there. Prince William, Kate Middleton, Prince Charles and Camilla Parker Bowls.
According to the Royal Protocol, members of the royal family must arrive at the event last and depart first.
The protocol dictates that all guests are in place before the Queen arrives.
Meanwhile, Joe Biden will hold a solo news conference after meeting his Russian counterpart Vladimir Putin next week.
Putin's performance at a 2018 news conference with Donald Trump led to shock when the then U.S. president cast doubt on the findings of his own intelligence agencies and flattered the Russian leader.
"We expect this meeting to be candid and straightforward," a White House official said.
"A solo press conference is the appropriate format to clearly communicate with the free press the topics that were raised in the meeting — both in terms of areas where we may agree and in areas where we have significant concerns."
Biden will meet Putin on June 16 in Geneva for a summit that will cover strategic nuclear stability and the deteriorating relationship between the Kremlin and the West.