Even after the White House confirmed the summit, the run-up to it was not without roadblocks.
Rodman said he hopes everyone reads it before the summit and reiterated that "we've got the greatest negotiator of all time" to "show the world how it's done".
That's a sign he's confident about his grip on power back home.
"I have little expectation from the summit", he said.
Sporadic provocations by the North have continued while Pyongyang has made increasing advances in its nuclear arsenal, which it says it needs to defend against the risk of a US invasion.
The two leaders have had an extraordinary up-and-down relationship over the past 18 months. Earlier on Monday, he was part of a Singaporean delegation that hosted Trump and the American delegation for a working lunch at the Istana hotel.
Trump and Kim lookalikes hold ´summit´ in Singapore
I think the G8 would be better, I think having Russian Federation back in would be a positive thing. "He has an opportunity, the likes of which if you look in history, few people have ever had".
Business as usual in North Korea as public unaware of summit
It is unclear, however, under what terms North Korea would agree to in an effort to reduce its nuclear arsenal. Trump arrived in Singapore after another meeting with foreign leaders - a group of close American allies.
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While Trump's relationship with some of the G7 members has reportedly been tense, one quickly came to his defense. He said: "The United States has been taken advantage of for decades and decades and we can't do that anymore".
The cover of this week's edition of The Economis.
In return, Kim, said to be in his mid-thirties, called Trump "mentally deranged" and a "dotard". He also told Lee the decision to hold the summit in the island city-state of Singapore was "made very consciously" and offered his gratitude. China has always been the North's most important ally. The article also stresses the need for confidentiality - meaning Trump will have to resist tweeting the minutes of the meeting.
Olivia Enos, policy analyst with the Asian Studies Center at The Heritage Foundation in Washington, said "a successful summit would move beyond mere statements about denuclearisation".
Beyond the impact on both leaders' political fortunes, the summit could shape the fate of countless people - the citizens of impoverished North Korea, the tens of millions living in the shadow of the North's nuclear threat, and millions more worldwide. In an op-ed, the Associated Press has expressed doubts that Kim "would fully relinquish his nuclear arsenal, which he may see as the guarantor of his survival".
While the main attraction of the summit will inevitably be the historic meeting between Trump and Kim, that wasn't the first world leader he met with on this trip.
North Korean leader Kim Jong Un, left, meets with Singapore's Prime Minister Lee Hsien Loong at the Istana or presidential palace, in Singapore, June 10, 2018. Forging a peace treaty involving South Korea may be another topic of the Trump-Kim meeting.
Mr. Pompeo praised the G-7 nations for their help getting North Korea talks set up.
He said his perception of Kim - a "bad guy with nuclear weapons" - had improved considerably following his two meetings with South Korean President Moon Jae-in at the border truce village of Panmunjom. More than 1,000 journalists from around the globe have converged on Singapore, though few may actually lay eyes on the two leaders.