Donald Trump says his latest Nobel Peace Prize snub has left an "indelible stain on Norway".
The award's Norwegian committee gave the award to Navanethem "Navi" Pillay, a South African jurist and former UN for human rights commissioner who once represented Nelson Mandela.
It said she was a "source of hope and inspiration to all those who seek to bring about a more peaceful world".
Mr Trump struck a very different tone, however, dismissing Ms Pillay, 85, as an unknown "liberal person" who "hates Israel" as he again claimed he should have won for settling "eight wars".
The president has made no secret of his desire to win the prize, and was also critical when Venezuela's Maria Machado won the award last year.
She later gave her medal to Mr Trump during a White House visit.
Writing on Truth Social, the US president claimed "every President and Prime Minister" from the countries he has helped had sent letters to the committee.
"Likewise, with Iran, I stopped them from destroying Israel, the Middle East, and Europe," he wrote. "I am also preventing, on a constant basis, a War between South Korea and North Korea, and Japan and North Korea.
"Add China and Taiwan, and numerous other hot spots, which have not been involved in Wars, only because of President Donald J Trump, and the United States of America."
He added: "This is an indelible stain on Norway, one that will never be forgotten."
Mr Trump said that he was "close" to ending the Iran and Ukraine conflicts.
In a later post, he said: "I settled 8 WARS, am close to ending or settling 2 more, got all of the Israeli hostages back... had hundreds of hostages, from countries all over the World, released and sent back home, won a war in Venezuela, and captured the violent dictator who so viciously ran that country, and stopped the number one state sponsor of terror, the Islamic Republic of Iran, from obtaining a Nuclear Weapon - AND MUCH MORE!
"Yet, with all of that I, or the United States of America, did not get the Noble Peace Prize. WOW!"
He made similar comments at a mid-term campaign rally in Syracuse on Friday, telling the crowd the prize was "forever discredited" by not being awarded to him.
Hours after Ms Pillay was revealed as winner, Mr Trump's administration also announced sanctions on the International Criminal Court, for which she used to work.
The US has previously imposed sanctions on judges and prosecutors, but the latest move to "ban transactions" with the "rogue court" means firms that provide services could also be penalised.
The court called it an "assault on the rule of law and on the very foundations of the international legal order".
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Ms Pillay's win will be seen as a rebuke to the US president, as well as Israeli Prime Minister Benjamin Netanyahu.
Both leaders have both rejected the findings of a UN commission she led which last year concluded that Israel was responsible for genocide in Gaza.
Israel vehemently denied the claims, and refused to co-operate with the commission.
It said on Friday that giving her the prize was a "grotesque weaponisation of an award to legitimise anti-Israel hatred and prejudice".
Ms Pillay has denied claims of antisemitism.
Who decides the Peace Prize?
The committee is made up of five members chosen "to reflect the relative strengths of the political parties" in the Norwegian parliament.
However, current members of parliament and government ministers are excluded.
The committee accepts nominations from people who meet certain criteria, including members of national governments and previous winners.
A shortlist of around 20-30 nominations is drawn up and advice sought from a body of advisers, which the committee says "generally consists of a small group of Norwegian university professors with broad expertise in subject areas with a bearing on the Peace Prize".
Other experts may also be consulted before a final decision is made every October.
If all members can't agree, a majority vote is conducted.
This year 208 people and 79 organisations were nominated. Details of who was nominated, and by whom, are kept secret for 50 years.
(c) Sky News 2026: Donald Trump labels latest Nobel Peace Prize snub an 'indelible stain on Norway'
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