Trump also confirmed that a deal with North Korea is very much in the making, and if completed, it would be a very good one for the world, a day after he stunned the global community by accepting an invitation to meet Kim.
"This meeting would not take place without concrete actions that match the promises made by North Korea," White House Press Secretary Sarah Sanders said at a news conference, adding that the time and place for the meeting is yet to be determined.
"The deal with North Korea is very much in the making and will be, if completed, a very good one for the World. Time and place to be determined," Trump said in a tweet, as experts and analysts scrambled to decipher the unexpected and surprising decision of the president.
The US, however, maintained that the time and place for the meeting has not been determined, after Trump said he has agreed to meet Kim by May, setting the stage for a historic summit between the two leaders who have repeatedly traded insults amid spiralling tensions over Pyongyang's nuclear and missile programmes.
Last night and this morning, Trump has had a series of telephonic conversations with a number of world leaders, who have been involved with the US on the North Korean issue.
Sanders said the US has accepted the invitation to talk based on the commitment made by North Korea.
"We are making no concessions. We are not going to move forward until we see concrete and verifiable actions from North Korea," she said.
Earlier in the day, US Vice President Mike Pence said that North Korea's desire to meet to discuss denuclearisation while suspending all ballistic missile and nuclear testing is evidence that Trump's strategy to isolate the Communist regime is working.
"The North Koreans are coming to the table despite the United States making zero concessions and, in close coordination with our allies, we have consistently increased the pressure on the Kim regime," he said.
"Our resolve is undeterred and our policy remains the same: all sanctions remain in place and the maximum pressure campaign will continue until North Korea takes concrete, permanent, and verifiable steps to end their nuclear programme," Pence said.
Sanders said Trump is hopeful that the US can make some continued progress.
"What we know is that the maximum-pressure campaign has clearly been effective. We know that it has put a tremendous amount of pressure on North Korea," she said.
"They have made some major promises. They've made promises to denuclearise. They've made promises to stop nuclear and missile testing. They have recognised that regular military exercises between the US and its ally, South Korea, will continue. The maximum-pressure campaign, we're not letting up," she said.