North Korea has labeled Joe Biden a “fool of low IQ” and an “imbecile bereft of elementary quality as a human being” after the U.S. presidential hopeful called North Korean leader Kim Jong Un a tyrant during a recent speech.

Pyongyang’s official Korean Central News Agency on Wednesday said the former American vice president had insulted the country’s supreme leadership and committed an “intolerable and serious politically-motivated provocation” against the North.

Biden during a campaign launch in Philadelphia on Saturday accused President Donald Trump of cozying up to “dictators and tyrants” like Kim and Russian President Vladimir Putin.