The summit would have been the first ever meeting between a sitting USA president and North Korean leader.
Trump had initially sought to placate North Korea, saying that he was not pursuing the "Libya model" in getting the North to abandon its nuclear weapons program.
That statement referred to USA vice president Mike Pence as a "political dummy" for his comments on the North and said it was up to the Americans whether they would "meet us at a meeting room or encounter us at nuclear-to-nuclear showdown".
Mr Trump told reporters that United States officials are in talks with North Korea after the country's "very nice statement" on Friday, less than 24 hours after Mr Trump cancelled the highly anticipated meeting.
He was not informed of the decision before Mr Trump's announcement, reports said. That presents an opening for diplomacy to continue if Washington is still game.
Change in overall tone notwithstanding, Kim didn't cave on Pyongyang's demand that Washington drop its insistence on unilateral denuclearization before it lifts Trump's policy of "maximum pressure". "In the span of 24 hours, we've gone from President Trump writing an actual letter to Kim canceling the summit, to a day later saying the summit might be back on".
U.S. president Donald Trump said his administration is in contact with North Korea and that a June 12 summit with the country's leader Kim Jong-un might take place, a reversal of comments the White House made a day earlier. But he also left open the possibility of arranging another meeting.
Pompeo's statement came after US President Donald Trump cancelled his proposed summit meeting with Kim on June 12 in Singapore.
Park Jung Eun, Secretary General for People's Solidarity for Participatory Democracy, a civil society organization that advocates for democracy, also condemned Trump's move.
But clearly Moon faces the greatest test of his diplomatic skills since he used his hosting role for the Winter Olympics in February to renew the push to resolve the nuclear standoff with Pyongyang. In a fiery rebuttal, North Korea blasted Pence as a "political dummy" and threatened the United States with a nuclear strike. They announced they would be holding a candlelit vigil Friday evening in response to Trump canceling the summit.
USA officials also complained North Koreans did not show up to preparatory meetings and would not answer calls. -South Korean military drills.
The White House said Trump dictated the letter himself. Late a year ago, the Trump administration reportedly was close to sanctioning Agricultural Bank of China and China Construction Bank-two of the largest in China with more than a trillion dollars of assets each-but held back for fear of the impact on the global economy.
But Pyongyang has vowed it will never give up its nuclear deterrent until it feels safe from what it terms U.S. aggression. But they would have focused on ways of denuclearising the Korean peninsula and reducing tensions.
Her friend, also a National University student, said the move would further unsettle East Asian allies concerned that America First means "Trump is just going to do whatever he wants". "The US thinks China might have spoiled the [summit] plan".
But he said talks could still go ahead "at a later date".
If both sides take more time, they might find themselves closer together.