Joe Biden breached royal etiquette when he recently met with The Queen, a royal expert has claimed.

Per BBC News, the POTUS, accompanied by FLOTUS Jill Biden, met Her Majesty at Windsor Castle on Monday, June 18, after attending the G7 summit in Cornwall, England.

While the Guard of Honour played a rendition of the US National Anthem, Biden stood with his hand on his heart to the Queen's left, wearing a pair of black aviator shades.

Take a look at this video of Biden meeting Her Majesty:

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Speaking with Newsweek, Grant Harrold - a former butler to Prince Charles and Camilla Parker Bowles - stated that the President inadvertently made a faux pas when he wore sunglasses while meeting the Queen.

Harrold claims that this is in breach of royal protocol, stating:

"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."

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Harrold continued: "It's fine for Biden to have had sunglasses on but he should have removed them when he actually met the Queen. Everyone else has to.

"It doesn’t matter who you are, even royals remove sunglasses when they meet royals. It's one of those rules I always write about in my etiquette texts.

"It is a breach of protocol. I get the sun might have been shining in his eyes but the Queen didn't have sunglasses on [and] Jill, the First Lady, didn’t have sunglasses on."

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BBC News reports that the meeting between the Bidens and Her Majesty was a cordial one. After inspecting the assembled Honor Guard, the POTUS and FLOTUS enjoyed tea with The Queen in Windsor Castle's Oak Room.

Per the above publication, President Biden later commented on the rendezvous by stating: "We had a long talk. She was very generous.

"I don't think she'd be insulted but she reminded me of my mother. In terms of the look of her and just the generosity. She was very gracious."

He added: "She said, 'What's it like in the White House?' I said, 'Well it's magnificent but it's a lot of people.'"

Featured Image Credit: Alamy/UPI

President Biden 'broke multiple etiquette rules' when he met The Queen, royal expert says