The president told reporters that it's "so far, so good" as he headed into what he called "unknown territory in the truest sense". Trump said on June 1 that "We're not going to go in and sign something on June 12 and we never will", noting that the summit was about "start [ing] a process".
Kim and Ri both joined Kim Jong Un for the April 27 inter-Korean summit, and Kim Yong Chol recently traveled to the U.S.to meet Secretary of State Mike Pompeo before delivering a letter from Kim Jong Un to Trump at the White House.
Ahead of his much-anticipated meeting with Kim, the US President sounded optimistic and said the meeting would be a "one-time shot" at peace.
Mr Trump has said it normally takes him about five seconds to figure out whether he will get along with someone.
"If diplomacy fails, will you support my efforts to authorize the use of military force as a last resort to convince North Korea and China that things are going to be different this time?" he said on ABC News.
North Korean leader Kim is expected to arrive at Changi airport tomorrow, a source involved in the planning of the trip told Reuters yesterday.More news: Rafael Nadal vs Dominic Thiem, French Open 2018 men's final
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Sources told CNN that United States officials have established a contingency plan for a potential second day of discussions between Trump and Kim depending on the direction of their planned meeting on June 12.
"And again, I say that with hope that maybe something can happen", said the U.S. President. He cited Trudeau's comments as a reason to withdraw from the G-7's official statement, underscoring the unpredictable nature of negotiations with the American president.
According to the reports, Singapore is only the third country North Korean leader Kim has visited since he became the nation's leader in 2011.
"I feel that Kim Jong Un wants to do something great for his people and he has that opportunity". But then Trump did a quick pivot, signaling nearly immediately after scrapping the meeting that he was open to going ahead with it after all. "So we are going in with a really positive spirit". "I would say that would be the minimal".
But after a cooling of the rhetoric, both sides began forging tentative contacts that eventually saw Mike Pompeo - the former head of the Central Intelligence Agency who is now secretary of state - meet Kim in Pyongyang.
Experts believe the North is on the brink of being able to target the entire USA mainland with its nuclear-armed missiles, and while there's deep skepticism that Kim will quickly give up those hard-won nukes, there's also some hope that diplomacy can replace the animosity between the US and the North.
The upcoming summit has been at the center of worldwide attention amid hopes that it will yield a major breakthrough in the decades-long efforts to denuclearize the North and establish a peace regime on the divided Korean Peninsula.
At stake at the summit are North Korea's nuclear weapons and peace on the Korean Peninsula.