Boris Johnson in Cornwall for G7 and Joe Biden on Air Force One

The PM was seen holding a briefcase and giving a thumbs up from the steps of an aeroplane after it touched down in Cornwall.

Announcing his arrival on Twitter, Mr Johnson said: "I’ve arrived in Cornwall for this year’s G7 where I’ll be asking my fellow leaders to rise to the challenge of beating the pandemic and building back better, fairer and greener.

"It will be a busy and important summit, and I can’t wait to get started."

It's as American President Joe Biden and his wife Jill are expected to touch down in Cornwall this evening or early tomorrow, on their first official overseas trip since he became President.

President Joe Biden and first lady Jill Biden arrive to board Air Force One. Picture: Andrew Harnik/AP

The exact time of their arrival has not been announced for security reasons.

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However, they left the USA on board Air Force One earlier today from Joint Base Andrews near Washington, heading for RAF Mildenhall in Suffolk.

Mr Biden is then expected to fly on to Cornwall, ahead of a meeting with the Prime Minister tomorrow (Thursday) before the start of the three-day summit on Friday. It is not known what the plans of the First Lady are.

President Joe Biden salutes as he boards Air Force One upon departure from Andrews Air Force Base near Washington. Picture: AP Photo/Alex Brandon)

In an article for the Washington Post, Mr Biden said the trip was about “realising America’s renewed commitment to our allies and partners” and that his meeting with Mr Jonson would “affirm the special relationship between our nations”.

However, it has been reported that Mr Johnson is not a fan of the expression.

I’m on my way to the U.K. and Europe today for the first foreign trip of my presidency. I know that democracies can rally together to meet the challenges of this new age – this week, in Europe, we have the chance to prove that.

— President Biden (@POTUS) June 9, 2021

According to the Press Association, Downing Street said Mr Johnson “prefers not to use the phrase” and wants to develop a “close relationship” with Washington.

In an eight-day visit to the UK, the President and the First Lady are also expected to meet with the Queen at Windsor Castle, after the conclusion of the summit.