The alliance between the US and the UK should be known as the “indestructible relationship”, Boris Johnson has told the BBC after meeting US President Joe Biden for the first time.
He said he had “terrific” talks with Biden, who has travelled to Cornwall for the G7 summit of world leaders, reports the BBC.
The summit begins later, with vaccines and climate change on the agenda.
Johnson insisted the US president had not rebuked him over post-Brexit tensions in Northern Ireland.
However, Biden is said to have “deep concern” over the situation.
The two men met in Carbis Bay, Cornwall on Thursday ahead of the start of the G7 summit, which will see the leaders of Canada, the EU, France, Germany, Italy, Japan, the US and UK gathering in person for the first time since the pandemic.
Ahead of the meeting, Johnson pledged the UK would donate more than 100 million vaccines to poorer countries in the next year, while Biden promised half a billion doses of Pfizer vaccines to 92 low and middle-income countries and the African Union.
The G7 nations are expected to collectively agree to provide a billion doses of Covid-19 vaccine in an effort to end the pandemic in 2022.
In an interview with the BBC’s political editor Laura Kuenssberg, Johnson said the UK and US shared a belief in human rights, the rules-based international order and the transatlantic alliance.
He said he thought of the association as “an indestructible relationship” or the “deep and meaningful relationship”.
“It’s a relationship that has endured for a very long time, and has been an important part of peace and prosperity both in Europe and around the world,” he said.
The PM had previously let it be known that he preferred a new term for the so-called “special relationship” between the UK and US after decades of use.
One area which could cause friction between the two men is the Northern Ireland Protocol – the part of the Brexit deal that prevents checks along the Irish border.
Biden has previously warned that the new arrangements should not jeopardise the Good Friday Agreement, a peace deal signed in 1998 that helped end decades of violence in Northern Ireland.
Asked if Biden had expressed his concerns, Johnson said: “No, the president didn’t say anything of the kind.”
The prime minister did suggest the way the EU was implementing the agreed arrangement was “excessively burdensome” and said while the UK, the US and the EU wanted to preserve the balance in Northern Ireland, a resolution to the issue was unlikely to be found in the coming days.
However, he added that the different sides would be able to “work it out”.
The arrangements were set down in the 2019 Brexit withdrawal deal, but the UK has since sought more flexibility.
Speaking on Thursday, European Commission President Ursula von der Leyen said the protocol was the “only solution” and should be implemented fully.
And French President Emmanuel Macron said: “I think it’s not serious to want to review in July what we finalised after years of debate and work in December.
“We have a trade deal – it has been painfully discussed for years… if six months later, they say: ‘What we negotiated with you, we don’t know how to respect it’, then that means that nothing is respectable anymore.”