Extraordinary pictures show Kim Il-sung Square in the capital Pyongyang packed with pious North Koreans shouting slogans and waving banners.
Raising their fists in salute to Kim, demonstrators hailed his explosive denunciation of Trump square in terrifying display of nationalist fervour.
Kim warned Trump we will "pay dearly" for threatening to "totally destroy" North Korea in his debut speech at the United Nations.
In an unprecedented personal statement, Kim said Trump will "face results beyond his expectation" for his aggressive remarks.
Trump branded Kim a "madman" who will be "tested like never before" in response.