"The mentally deranged behavior of the U.S. president openly expressing on the UN arena the unethical will to 'totally destroy' a sovereign state, beyond the boundary of threats of regime change or overturn of social system, makes even those with normal thinking faculty think about discretion and composure," Kim said in a statement circulated on state news agency KCNA.
Kim urged the president to "exercise prudence in selecting words" after Trump on Tuesday issued a harsh warning to Pyongyang. The president threatened to "destroy" the communist nation if it threatened the United States.
Early Friday, Kim said that the president's remarks at the U.N. merit the "highest level of hard-line countermeasure in history." The dictator said he is "thinking hard" about what kind of reaction Trump could have possible expected when he delivered those remarks.