Trump had called Kim "Little Rocket Man" and threatened to unleash "fire and fury like the world has never seen" on North Korea as it conducted several ballistic missile tests in defiance of worldwide warnings.
Kim is meeting Trump on Tuesday for a historic summit aimed at discussing the future of his nuclear program.
The report also said Mr Kim was accompanied by his foreign minister Ri Yong Ho, defence minister No Kwang Chol and sister Ms Kim Yo Jong. The North Korean autocrat's every move will be followed by 3,000 journalists up until he shakes hands with Trump.
Though Trump has been criticized for his failure to demand more concessions from North Korea before agreeing to a face-to-face meeting, which experts say gives Kim the sort of legitimacy on the global stage he desires, downplaying expectations does two things.
Along with an extensive security detail, the North Korean leader took his own personal toilet to the meeting.
Even though the big meeting isn't on the schedule until Tuesday in Singapore, there were still plenty of interesting developments over the course of the first full day that President Donald Trump has been in the city.
It "would instead lay out practical steps with requisite commitments from North Korea that demonstrate that it understands, accepts and is committed to achieving denuclearisation as the USA defines it", said Enos, who is also in Singapore to watch the proceedings.
The White House said the daylong summit would also include a working lunch and a larger meeting involving aides to both leaders.
She said Sung Kim, the USA ambassador to the Philippines, who has taken the lead on policy negotiations with the North, was set to hold a working group with a North Korean delegation at 10 a.m. Monday.
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North Korean leader Kim Jong Un with Singapore's prime minister, Lee Hsien Loong, at the Istana in Singapore on Sunday.
Mr Kim inspecting the honour guard in Pyongyang before departing for Singapore on June 10, 2018.
On Monday, U.S. Secretary of State Mike Pompeo suggested U.S. sanctions and other worldwide pressure will continue until North Korea takes steps toward denuclearization.
Mr Trump has announced the restoration of USA sanctions, while European leaders are trying to preserve the deal.
But, prior to leaving Canada, the mercurial president again changed his tune, calling it a "one-time shot" and adding that he would know "within the first minute" of meeting Kim whether an agreement will be possible.
"I think we should take some optimism from that reporting", the official said.
While fighting a trade war with allies, Trump now brings his America First negotiating style to the deadly topic of North Korea's nuclear weapons. As a part of that process, he also announced a suspension of nuclear and missile tests and the dismantlement of a key atomic testing facility that was carried out last month. Long-time United States allies like Canada and Germany protested Trump-backed tariffs on their exports, and threatened to retaliate with their own tariffs on U.S. products.
It's not just the logistics of Kim's trip that are unclear.