President Joe Biden's meeting with the Queen may not have gone as well as it appeared.

The US president met Queen Elizabeth on Sunday in the UK, and the occasion was largely well-received. However, President Biden has since been accused of breaking two rules for meeting the Queen.

President Joe Biden broke rules meeting Queen Elizabeth

According to one royal expert, Biden made a bad first impression with the Queen. The reason? He didn't remove his sunglasses when he arrived and first greeted the monarch.

Queen Elizabeth II meets Jill and Joe Biden on June 13, 2021.

"If you're meeting the Queen face-to-face there's no sunglasses or anything like that at all because eye contact is quite important with any introduction," Grant Harrold told Newsweek.

Harrold, a former royal butler, added: "Everyone else has to, it doesn't matter who you are, even royals remove sunglasses when they meet royals."

It was a sunny evening in Windsor on Sunday, and Biden only removed his trademark aviator sunglasses when he left the Queen's side to inspect the Guard of Honour.

President Biden's second etiquette violation

In addition, President Biden was accused of another etiquette violation: for revealing the contents of his private conversation with Queen Elizabeth.

Before departing from Windsor, Biden told reporters that the Queen privately asked him about Russia's Vladimir Putin and China's Xi Jinping.

Broken rule? President Biden tells reporters about his conversation with the Queen.

Royal expert Richard Fitzwilliams told Daily Mail that Biden's move was a "breach of trust," as audiences with the Queen are "strictly private."

There is debate on if this protocol is outdated, but the expert still said it was "surprising" that the president quickly told the media about the Queen's questions, especially as they related to politics.

President Biden and First Lady Jill Biden were in the UK last week for the 2021 G7 Summit. They briefly met the Queen at a reception on Friday before visiting Windsor Castle for tea on Sunday night.

You can also revisit the broken rules from Donald Trump's meeting with the Queen here.

Victoria Beckham, recipient of the 2018 Fashion Icon Award, poses in the press room during the People's Choice Awards 2018 at Barker Hangar on November 11, 2018 in Santa Monica, California

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