Mr Trump, speaking in his home city of New York, also took aim at Iran, who he accused of pursuing an agenda of destruction, in his speech at the world body’s headquarters.
The US President doubled down on his description of North Korean leader Kim Jong Un as ‘Rocket Man’ and accused the third-generation of the hermetic state’s dynastic leadership of being on a suicide mission.
The hardline stance follows a series of weapons tests by the Pyongyang regime, including a number of recent launches that saw missiles launched over Japan.
In a speech that was at times less bombastic than the businessman’s freewheeling campaign style, the President was heard to mispronounce the name of the organisation he was addressing, referring to the “Unaided Nations”.
He also said the Iranian government was running an “economically depleted rogue state” whose chief export is violence.
Twitter users raised a smile when photos from the event appeared to show White House Chief of Staff John Kelly with his head in his hands as Donald Trump stepped up his attacks on fellow UN nations.
It is the second time General Kelly’s reactions have gone viral, after he was photographed seemingly looking aghast as the President equivocated following the racially charged violence in Charlottesville, Virginia.