His tweets come hours after the president told reporters at the G-7 summit that he would know within the first minute of meeting Kim whether the North Korean leader is serious about reaching a deal with the United States.
Asked how long it would take for him to know if Kim was honest about giving up nuclear weapons Mr Trump said: "I think within the first minute I'll know".
New York Times op-ed columnist and foreign policy expert Nicholas Kristof says South Korean President Moon Jae-in has brilliantly manipulated both Donald Trump and Kim Jong-un to get them to the same negotiating table. "It's a one-time shot", he said at a press conference, adding that the North Koreans had been working "very well with us".
North Korea's catastrophic human rights record is inextricably linked with the threat of its nuclear weapons, and addressing those abuses can not be avoided.
Trump days later announced that the summit was back on but has remained only cautiously optimistic about how the historic meeting would pan out. He said he thinks "it's going to work out very well".
Rodman has faced ridicule and criticism for his trips to North Korea, which some USA politicians and activists view as serving only as fodder for North Korean propaganda.
But the first-ever meeting between a sitting USA president and a North Korean leader will surpass them all in the sheer spectacle, a summit of global significance timed to begin squarely during prime time in the United States on Monday evening, a strategic decision by the ratings-conscious president. "It's a big gamble and I'm not sure I have a good answer for what is best".
He has not shied from using flattery either - he was the first to say Mr Trump could be nominated for a Nobel Peace Prize.
"There is a feeling of excitement in this school - many students, parents and teachers are highly anticipating this summit", said Lee.
The summit meeting will take place at 9 a.m. local time Tuesday - 9 p.m. Monday Eastern time - at the Capella Hotel on the resort island of Sentosa off Singapore's southern coast.
But because the realization of a US-North Korea meeting has been so unexpected, unprecedented, and personalized, it will provide a unique opportunity for both sides to test their assumptions about the intentions and motivations of the other.
"This is a leader who really is an unknown personality", Trump added of Kim. "The regime is employing a wait-and-see approach to the issue, which makes sense from their point of view".
"But we have to, I think, remind people there are a couple of hundred thousand people in brutal death camps. And it used to be the G8, not the G7", Trump told reporters after the G7 summit in Quebec.
The U.S. and North Korea have disagreed about what "denuclearization" would actually entail. So, the president, I can imagine him saying, 'We've agreed on this peace treaty, ' which is what we said in 2005.
Matt Kulesza with two North Korean students.
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