US President Joe Biden allegedy said "I hate the English" in a behind closed doors meeting in the mid-to-late 2000s.
The reference surfaced on the Rest is Politics podcast, presented by former Labour spin doctor Alastair Campbell and ex-Tory minister Rory Stewart.
The pair were navigating the "special relationship" between the UK and the US, saying Britain is no longer the top priority in Europe, The Express reported.
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During the episode, Campbell and Stewart talked about President Biden, suggesting that he enjoys "playing up his Irish-ness".
Mr Stewart opined that Biden's "anti-Britishness" arose during his time as Vice President under Barack Obama.
"When we were briefing him on Iraq in the mid to late 2000s. One of my friends came in to brief him and came out completely shocked because she'd gone in to try and explain the Sunni-Shia dimension in Iraq and he, then Vice President to Obama, said: 'I completely understand the situation. They hate each other. I'm Irish. I hate the English.' And that was his absolutely off the cuff normal comment back in the 2000s," he said.
He claimed to have "100% cast-iron sourcing" on the allegations.
He added: "When you tell this story to people close to Biden they laugh, he makes this sort of joke all the time."
The comments came after some alleged that Biden appeared to snub King Charles's Coronation on May 6.
First Lady Jill Biden later attended King Charles III's Coronation on behalf of the president.
A European Research Group source said at the time that his decision to visit Northern Ireland - while skipping the Coronation - was a "very disappointing decision", and was labelled a "snub."
Speaking to Express.co.uk, they said: "Regarding the Coronation, I have no clue what he is thinking. They can try and spin it all they want but it is still a snub.
"After all that we have done together, particularly regarding Ukraine, it seems like a very disappointing decision."
Meanwhile, Eurosceptic MP David Jones said Biden visited the North to add to his re-election prospects.
"It’s a pity he can’t come to the Coronation but, given his age, perhaps that’s not too surprising," the MP stated.
Following his visit to Northern Ireland to mark the 25th anniversary of the Good Friday Agreement, Biden has sparked further controversy.
Express.co.uk has reached out to the White House for comment.
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