The remark came after Trump said he would “totally destroy” North Korea if the US had to defend itself, and referred to North Korean dictator Kim Jong-un as “rocket man,” in a speech to the United Nations.

Kim Jong-un issued a retort on North Korean state media in which he called Trump a “mentally deranged dotard.”

The statement continued, saying Trump was “unfit to hold the prerogative of supreme command of a country,” and was “a rogue and a gangster fond of playing with fire.”

When relations between the US and North Korea again started to worsen in 2019, the latter threatened the resumption of such insults.

Dotage is defined by Merriam-Websters as “a state or period of senile decay marked by decline of mental poise and alertness.”

Trump, after meeting Kim Jong-un at the Singapore Summit later said that if he was wrong about trusting the dictator, he’d “find some kind of excuse.”

USA Today – North Korean leader: Trump is ‘mentally deranged’
BBC News – ‘Dotard’ Trump? The story of ‘rocket man’ Kim’s insult
AP News – North Korea threatens to resume calling Trump ‘dotard’
Merriam-Webster – Dotard