President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Saturday dismissed concerns about missile tests earlier this month and said he had confidence in North Korean Leader Kim Jong Un Kim Jong UnSatellite images indicate North Korea preparing for massive military parade South Korea warns of underwater missile test launch by North Korea Trump says he didn't share classified information following Woodward book MORE.

"North Korea fired off some small weapons, which disturbed some of my people, and others, but not me," he wrote. "I have confidence that Chairman Kim will keep his promise to me."

National security adviser John Bolton John BoltonMaximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales Ex-NSC official alleges 'unprecedented' intervention by White House aides in Bolton book review MORE on Saturday called the North Korean missile tests a violation of United Nations resolutions.

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“U.N. Security Council resolutions prohibit North Korea from firing any ballistic missiles,” Bolton told reporters in Tokyo, according to The Associated Press ahead of Trump's arrival Saturday. “In terms of violating U.N. Security Council resolutions, there is no doubt about that.”

The president also said he "smiled" when Kim referred to 2020 Democratic front-runner former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE as a "low IQ individual."

North Korea fired off some small weapons, which disturbed some of my people, and others, but not me. I have confidence that Chairman Kim will keep his promise to me, & also smiled when he called Swampman Joe Bidan a low IQ individual, & worse. Perhaps that’s sending me a signal? — Donald J. Trump (@realDonaldTrump) May 25, 2019

North Korean state media outlet KCNA on Tuesday called Vice President Joe Biden a “fool of low IQ” after Biden called Kim a tyrant.

President Trump is in Japan this weekend to meet with Prime Minister Shinzo Abe.