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The Queen has met and worked with 12 US presidents during her 69-year reign, stretching back to Harry Truman in the 50s.
And this week she'll add the country's 46th leader, Joe Biden, and his wife Dr Jill Biden to that list as the couple visit the UK for the G7 Summit.
All eyes will be on the Monarch as she meets the Democrat, mostly from people hoping things go more smoothly than when she met his predecessor, Donald Trump.
Ahead of his 2019 visit, the controversial businessman made countless comments about his respect and admiration for the Queen and was extremely excited to meet her.
However it's fair to say he didn't exactly appear a natural when he met his "hero" during a visit to Windsor Castle as part of a four-day working trip to the UK.
The Queen hosted Donald Trump in 2019
(Image: AFP/Getty Images)
We've looked back at the day that left many cringing and others furious…
Row over who was late
When the big day finally arrived, the royals pulled out all the stops to welcome the US President and First Lady.
Millions watched live TV coverage as the Queen, wearing a hat and coat, stood in the summer heat for 15 minutes – twice appearing to check her watch – waiting for Trump's motorcade to arrive.
The Queen was waiting quite a while
(Image: AFP/Getty Images)
This caused outrage as people believed Trump was running late and kept the then 92-year-old waiting in the heat.
However, his arrival 5.01pm was bang on time according to the official schedule, so it seems claims he was late were unfair.
He hit out at the criticism, labelling it "fake, fake, disgusting news" and insisted he was 15 minutes early and was forced to wait in his helicopter.
However this always wasn't quite correct, as he landed at 4.50pm – right on time.
He later said: "I landed, I'm on the ground and I'm waiting with the King's and the Queen's guards, wonderful people. I'm waiting.
"I was about 15 minutes early and I'm waiting with my wife and that's fine.
"Hey, it's the Queen, right? We can wait. But I'm a little early."
Blocking her path
When things finally got going the Queen took the President to inspect the Coldstream Guards, walking side by side between the lines of soliders.
Well, they were walking side-by-side until Trump seemed to suffer some directional issues.
He ended up completely blocking out the Queen and hiding her from view completely.
The Queen directed Trump where to go
The Queen, dressed all in blue, had pointed to where the American businessman should walk as they inspected the troops – but instead he walked straight in front of her.
She obviously handled it like a pro and stepped around him and back onto the path – but people were furious.
Labour MP David Lammy tweeted: "What a disrespectful, discourteous, selfish and appalling way to treat a 92-year-old woman. Let alone the Queen of England, who has served this country faithfully for 66 years."
But he managed to walk straight in front of her
(Image: Getty Images)
No curtsy and a very, very quick bow
When Donald and Meania were introduced to the Queen, many Brits were outraged that the couple didn't appear to bow or curtsy.
"Am I the only one who thinks it was extremely disrespectful President and Melania Trump did not bow or curtsy to the Queen???", Lauren Plummer wrote on Twitter.
Joanna Marie added: "Absolutely fuming Trump and Melania didn’t bow/curtsy to the queen. Protocol may say they don’t have to but the Obamas did."
Donald offered a very small bow and his wife opted not to curtsy
However, eagle-eyed viewers have spotted Trump did in fact give a subtle bow of his head when he stepped out his Range Rover and locked eyes with the Queen.
Many people missed it because the car door was blocking the TV cameras showing the nod in full effect.
The Queen then greeted the couple with a smile and a handshake.
Similarly, former POTUS Barack Obama gave a similar nod of the head gesture when he met the monarch in 2009.
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And the Queen's former press secretary Dickie Arbiter has previously told of how bowing or curtsying when in the presence of a member of the Royal family is not necessary and there is not "hard and fast rule."
"Not unless one chooses to,” he said.
Meanwhile, a royal source told the Telegraph in 2014: “There is no protocol handbook at Buckingham Palace but people do tend to bow or curtsy to the Queen and that’s just good manners.
"But it’s true that no-one is obliged to do it.
“As for waiting for the Queen to speak first, there is no hard and fast rule, the Queen just wants people to feel comfortable.”
Awkward photo error
The Queen posed for a photo with the Trumps in one of Windsor Castle's grand corridors, but eagle-eyed watchers noticed a slightly odd detail.
Just in front of the President's foot is a dog bowl on a plastic mat, which we're assuming probably should have been moved before the historical snap was taken.
The inclusion shows that it's the Queen's home as well as being used for royal functions.
The bowl is believed to be used by Her Majesty's two 'dorgis' (dachshund-corgi crosses), Vulcan and Candy.
The trio smiled as they stood up straight with their hands by their sides, with Melania wearing a cream Dior suit.
In a photo in the same spot taken the following day, showing the Queen meeting King Philippe and Queen Mathilde of Belgium, the dog bowl appeared to have disappeared.
Staff had removed it in time for the next official photo
And Trump's review of the trip?
Trump boasted about how well the trip went later during a rally in Wilkes-Barre, Pennsylvania, describing the Queen as "fantastic" and saying they got on very well.
He also hit back at reports he had overstayed his welcome, and said he has "great respect" for Britain.
He added: "I then go up and meet the Queen and she is fantastic. We then go up and we have tea.
"And I didn't know this – it was supposed to last 15 minutes but it lasted like an hour. Because we got along. And she liked our first lady and our first lady liked her.
"But we got along fantastically well. But the time went by – you know, sometimes you get along and the time goes by.
"So here was the story by the fake news: The president was 15 minutes late for the Queen. Wrong.
"Here's the rest of the story: The president overstayed. So I was late and I overstayed. But honestly, folks, it was such a beautiful, beautiful visit and afternoon.
"But they can make anything bad because they are the fake, fake, disgusting news."
He also said of his visit: "People call it 'Britain', they call it 'Great Britain'. They used to call it 'England', different parts. But the UK – great respect."