A North Korean official reportedly assailed President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE as a “heedless and erratic old man” after the president tweeted that Chairman Kim Jong Un Kim Jong UnFormer GOP lawmakers on endorsing Biden: Trump is no Republican, 'lacks basic self-control' North Korean leader Kim apologizes over killing of South Korean official Pelosi knocks Trump over refusal to commit to peaceful transfer of power MORE valued the two’s relationship too much to allow international relations to sour.

Trump’s tweet stating that Kim “does not want to void his special relationship with the President of the United States or interfere with the U.S. Presidential Election in November” indicates the president is “bereft of patience,” former North Korean nuclear negotiator Kim Yong Chol said, according to The Associated Press.

“As [Trump] is such a heedless and erratic old man, the time when we cannot but call him a ‘dotard’ again may come,” he said, referencing an insult the nation applied to Trump in September 2017 amid a war of words between the two leaders.

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“Trump has too many things that he does not know about [North Korea]. We have nothing more to lose. Though the U.S. may take away anything more from us, it can never remove the strong sense of self-respect, might and resentment against the U.S. from us,” the official added.

North Korean officials have repeatedly threatened to resume the use of the "dotard" epithet in recent weeks after Trump resumed his use of the nickname “Rocket Man” for Kim during a NATO summit in London.

North Korea has also rebuffed the U.S. on more substantial issues relating to denuclearization, with officials saying the nation will not agree to further summits between the leaders that it says Trump would exploit as foreign policy victories unless the U.S. makes concessions of its own.

Pyongyang's Academy of National Defense on Sunday touted a “very important test” at a long-range rocket facility once slated to be dismantled.