President Trump called North Korean dictator Kim Jong Un "Rocket Man" Sunday, displaying a new nickname for the reclusive leader after a call with South Korean President Moon Jae-in.

"I spoke with President Moon of South Korea last night. Asked him how Rocket Man is doing. Long gas lines forming in North Korea. Too bad!" Trump tweeted.

I spoke with President Moon of South Korea last night. Asked him how Rocket Man is doing. Long gas lines forming in North Korea. Too bad! — Donald J. Trump (@realDonaldTrump) September 17, 2017

Trump has used his Twitter as his weapon of choice in a war of words with Kim in recent months, often tweeting threats and warnings to North Korea after a missile test. The most recent missile test took place on Thursday when the North Koreans shot a ballistic missile more than 2,000 miles into the Pacific Ocean.

The White House later released a readout of the call, saying in a statement the two leaders talked about the launch.

"The two leaders noted that North Korea continues to defy the international community, even after the United Nations strongly condemned North Korea's repeated provocations twice in the past week," the statement read.

"President Trump and President Moon committed to continuing to take steps to strengthen deterrence and defense capabilities and to maximize economic and diplomatic pressure on North Korea."

Trump also spent some of Sunday morning retweeting praise and memes from his supporters.

He later touted his schedule for the day.

"Important meetings and calls scheduled for today. Military and economy are getting stronger by the day, and our enemies know it. #MAGA," Trump tweeted.