With gaps remaining over what denuclearisation would entail, officials from both sides were trying to push the agenda forward ahead of Tuesday's summit.
When Trump and Kim meet at 9am local time on Tuesday at Sentosa, a resort island off Singapore's port, they will be making history. But after some diplomatic scrambling, the two leaders will now sit down together.
The only logical explanation for Rodman's visit to Singapore would have to do with the fact that he has been closely associated with Jong Un and Trump in the past.
"It will certainly be an exciting day and I know that Kim Jong-un will work very hard to do something that has rarely been done before".
The summit provides "an unprecedented opportunity to change the trajectory of our relationship and bring peace and prosperity" to North Korea, Pompeo told a news conference on the eve of the summit.
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The summit between Kim and Trump will cap a remarkable turnaround in relations between two men who were trading furious insults less than six months ago. For starters, we need to be realistic about what "success" means.
"The best possible outcome I see for this summit is a general outline of an agreement that identifies denuclearization as the end goal of a process to be determined", she said at a 38 North briefing.
First, the meeting must last longer than a minute. "I don't want to waste his time", he added.
Trump told Lee that he has a "very interesting meeting" tomorrow which he said is "going to work out very nicely".
Second, the content of the meeting must be holistic.
Donald Trump is promising big things can happen to the North Korean economy in return for moving away from its nuclear programme.
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After North Korea carried out a series of long-range missile tests that potentially put the U.S. mainland in range of a nuclear strike, Trump promised to respond with "fire and fury".
"So we are going in with a really positive spirit".
China and South Korea would have to sign off on any legal treaty.
Late on Monday. Trump phoned Moon from Singapore.
Media captionBarbed wire and smuggled crabs: Watching North Korea from China How did they arrive? Lee has said the summit would cost Singapore about S$20 million ($15 million), more than half of which would go on security.
Harry Kazianis, director of defense studies at the Center for the National Interest, said he is afraid of a summit that is only a photo opportunity.
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He came from a divisive G7 meeting in Canada with some of Washington's closest allies that further strained global trade ties.
Singapore knows how to handle events like this, however historic they may be.
Finally, a sense of continuity must be established.
Media captionTrump-Kim summit: Can you achieve peace on a plate? What it should be used for instead is as a starting point with a clearly articulated roadmap for continued dialogue.
Trump has said he hopes to make a legacy-defining deal for the North to give up its nuclear weapons, though he has recently sought to minimize expectations, saying additional meetings may be necessary.
But just previous year, Trump described the North Korean leader as "little rocket man", and warned of a US military attack full of "fire and fury".
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