But Trump, who was reportedly advised not to go easy on Pyongyang's leader, was also determined to walk out of the upcoming meeting if things went sideways.
But last week, former North Korean military intelligence official Kim Yong Chol met with Secretary of State Mike Pompeo in New York City.
However, he did add that he was sharing a personal opinion and is not part of Trump's foreign policy team.
Pompeo, first as Trump's Central Intelligence Agency director and now as his chief diplomat, quickly made North Korea his main focus.
The former NY mayor said there was no choice but to cancel the June 12 summit after Kim insulted the U.S. vice president and national security and threatened nuclear war.
There was no immediate response from the North Koreans to his comments.
On Thursday, it could again be put to the test - beyond North Korea, they are also meant to discuss the thorny issue of tariffs, which Washington says were put in place to protect American workers.
"This is and has been an aim of China and North Korea for a long time, and we can't allow this to happen".
North Korea's founding philosophy, known as Juche, emphasizes the ideas of strength and self-reliance independent of other nations. "They get security assurances, which includes certainly the normalization of relations with the United States, a peace treaty to end the Korean War, a nonaggression pact and economic development". "They have nothing to do with the administration, and a metaphor", he said.
Lee Sung-yoon from Tufts University said at a seminar in Washington on Tuesday that the summit is only a political show, voicing concerns that the meeting will produce more sound bites and video footage than substantive agreements.
Kim Jong Il's 34 was witnessed by 17 armed bodyguards, North Korea state media reported.
The summit will be held in the Capella Hotel on the exclusive resort of Sentosa, a tiny Singaporean island covered in golf courses that was once a pirate hangout.
There are worries in Tokyo that Mr Trump might strike a deal with North Korea that would sideline Japanese interests.
While the North has kept mum on its summit preparations, Trump's and his Twitter messages are a rare "credible" source of relevant information.
But plans for the 12 June bilateral in Singapore were revived after a conciliatory response from Pyongyang.