That was before the two had even met, and it was not clear whether it was good news or not.
Kim smiled broadly in the meeting Sunday evening.
Despite Kim's apparent eagerness for a summit with Trump, there are doubts that he would fully relinquish his nuclear arsenal, which he may see as the guarantor of his survival.
Trump will also meet with U.S. Embassy personnel later Monday.
Some images of Trump and Kim were even more lifelike. After leaving Canada, Trump called Trudeau "dishonest" and "weak" on Twitter.
Rodman described Kim as a "big kid" who wants to see the world.
President Trump traveled to the summit - which will be the first-ever meeting between a US president and a North Korean leader - from a G7 meeting in Quebec, Canada. Sung Kim, a former US ambassador to South Korea now posted to the Philippines, was scheduled to lead a USA delegation for a 10 a.m. working group session with a North Korean team at the Ritz Carlton Hotel.
Trump reiterated his promise Saturday that the U.S. Abbreviating the meeting to a single day could make it easier to cast the summit as an early, symbolic opening, rather than a substantive negotiation in which a lack of tangible progress would suggest failure on the part of the negotiators.
"His message from Quebec to Singapore is that he is going to meld the industrial democracies to his will - and bring back Russian Federation", said Steve Bannon, Trump's former campaign and White House adviser. The official was not authorized to speak publicly about internal deliberations and insisted on anonymity.
Lee Do-kyu, also 27 and unemployed, said the recent inter-Korean summits had raised his interest in politics, but it had waned rapidly. Illustrating the divisions within Trump's administration about the wisdom of pursuing diplomacy with the North, Pompeo has been a driving force behind the meeting as national security adviser John Bolton has become a more behind the scenes player.
But it was only Monday morning in North Korea that the government news agency reported that Kim was in Singapore, had met with the prime minister and would meet Trump on Tuesday.
Both leaders were greeted on arrival by Singapore Foreign Minister Vivian Balakrishnan.The summit's venue is the Capella hotel on Sentosa, a resort island off Singapore's port with luxury hotels, a Universal Studios theme park and man-made beaches. The leaders themselves had little to say.
Trump, who is staying at the Shangri-La Hotel, is due to meet Lee on Monday.
The White House later said discussions with North Korea had moved "more quickly than expected" and President Trump would leave Singapore on Tuesday night, after the summit. It is encouraging that Trump reportedly is willing to discuss diplomatic recognition and the opening of a United States embassy in Pyongyang. If the US President instead is willing to trade legitimacy for a regime that has been a thorn in America's side for the elimination of the nuclear threat, it has a chance to succeed.
Trump and Lee shared a warm handshake in front of cameras before they began their meeting at the Istana.
Asked by a reporter how he felt about the summit, Mr Trump said: "Very good".
Yet both Kim and Trump have come too far to risk any failure from the summit, and Kim's boldness and Trump's disposition as a deal-maker may come together to produce a surprising result, the former officials said. Meanwhile, U.S. and North Korean officials huddled at a hotel Monday ahead of the sit-down aimed at resolving a standoff over Pyongyang's nuclear arsenal.
"This shows that Kim is confident about the USA guarantee of North Korea's regime security and it is a way to externally showcase that his regime is functioning on a 'normal level, '" said Kim Yong-hyun, a professor at Dongguk University.
Singapore Summit news hub is now active on the AP News site and the mobile app.
Mr Trump has since sought to play down expectations, saying that the meeting will be an important first step, but that securing a deal will likely take many more meetings. The North has faced crippling diplomatic and economic sanctions as it has advanced development of its nuclear and ballistic missile programs.
The North Korean motorcade, believed to be carrying North Korean leader Kim Jong-un, travels.
"More than anything, it was China's decision to enforce sanctions that squeezed the economy and made removing of the sanctions an urgent task for Kim", he said. Just my touch, my feel.