President Joe Biden has been accused of breaking royal etiquette rules while meeting the Queen yesterday.

After his appearance at the G7 Summit meeting in Cornwall, the president of the United States took a slight detour.

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Biden and his wife, Dr. Jill Biden, decided to go and visit Her Royal Highness at Windsor Castle where they discussed the main events at the Summit including vaccines and climate change.

However, the president was criticized for breaking royal etiquette by experts who slammed it as a "breach of protocol."

Grant Harrold, a former butler to Prince Charles and Camilla, the Duchess of Cornwall told Newsweek that Biden's biggest faux pas was wearing shades.

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"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," he said, "It's fine for Biden to have had sunglasses on but he should have removed them when he actually met the Queen."

He continued:

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"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. Jill, the first lady, didn't have sunglasses on," he added.

​Despite this little mistake, the meeting between the 2 figures reportedly went well.

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While political figures who meet the Queen usually don't usually discuss their topic of conversation publicly, Biden later revealed to the media that Her Majesty had asked about Russian President Vladimir Putin and China's leader Xi Jinping.

"We had a long talk," he said, "She was very generous."

He also added that she asked what it was like at The White House: "I said, 'Well it's magnificent but it's a lot of people'."

The meeting was said to have overrun by ten minutes, but the president left feeling comforted, saying the monarch reminded him of his mother.

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

It looks like the president has just secured a very good relationship with Her Majesty and the United Kingdom!