Story highlights Trump is in Vietnam as part of a nearly two-week tour of Asia

He urged nations to stop trading with North Korea

(CNN) Donald Trump sarcastically responded to North Korea's insults that described him as a "destroyer" who "begged for nuclear war" during his tour of Asia.

In a statement lashing out at Trump on Saturday, North Korea also referred to him as a "dotard," a word meaning a very old person, and one the reclusive nation has used on him in the past.

Trump fired back hours later.

"Why would Kim Jong-un insult me by calling me 'old,' when I would NEVER call him 'short and fat?' Oh well, I try so hard to be his friend - and maybe someday that will happen!" Trump tweeted.

Why would Kim Jong-un insult me by calling me "old," when I would NEVER call him "short and fat?" Oh well, I try so hard to be his friend - and maybe someday that will happen! — Donald J. Trump (@realDonaldTrump) November 12, 2017

Asked about the possibility of becoming friends with the North Korean leader during a Sunday joint news conference in Vietnam, Trump did not rule it out.

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