Former DUP leader Arlene Foster has slammed Joe Biden, claiming the US president "hates the United Kingdom".
She said his visit to Belfast "won't put any pressure" on the party to restore Stormont because he is regarded as "simply pro-republican and pro-nationalist".
The former First Minister described Mr Biden as "the most partisan president there has ever been when dealing with Northern Ireland".
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She said: "The list goes on and on in relation to his dismissal of the British people living here in Northern Ireland."
Dame Arlene referenced several matters, including how Mr Biden previously met with former Sinn Fein leader Gerry Adams and the late republican Rita O'Hare.
Speaking to GB News, she added: "He revelled in the fact that he told a story about his mother refusing to sleep in a bed because the late Majesty the Queen had slept in a bed, so it goes on and on.
"He hates the United Kingdom, I don't think there's any doubt about that.
"And I just think that the fact that he's coming here won't put any pressure on the Democratic Unionist Party at all, quite the reverse actually, because he's seen by so many people as simply pro-republican and pro-nationalist."
US officials rejected the comments during a press conference.
Amanda Sloat, senior director for Europe at the US National Security Council, said it was "simply untrue" to suggest Mr Biden hates the UK.
"The fact that the president is going to be engaging for the third time in three months and then the next month and then again in June with the Prime Minister of the UK shows how close our cooperation is with the UK," she said.
Mr Biden is due to make a speech at Ulster University's new Belfast campus in the afternoon.
He will then travel to the Irish Republic, where he will carry out a number of engagements during his four-day stay, including visiting Co Louth and Co Mayo, from where his ancestors hail.
The US president's visit has been timed to coincide with the 25th anniversary of the Good Friday Agreement, which largely brought an end to the Troubles.
It comes at a time when Stormont's power-sharing institutions which resulted from the 1998 peace deal are not functioning.
The devolved government collapsed last year when the DUP pulled out in protest against Brexit's Northern Ireland Protocol.
The party has since raised concerns about the Windsor Framework deal between the UK and European Union which was aimed at addressing issues with new post-Brexit trade barriers.
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