The source says that the Pyongyang meeting, if it materialises, will follow up on the finer points of North Korea's denuclearisation which the two leaders are expected to broach at their first summit in Singapore on Tuesday (June 12).
In agreeing to meet with Trump, Kim is simply resuscitating the approach his country has pursued in previous negotiations, Revere warned.
Well, maybe, if anyone here knew it was happening.
In the run-up to the talks, Trump had hopefully predicted the two men might strike a nuclear deal or forge a formal end to the Korean War in the course of a single meeting or over several days.
"The entire world is watching the historic summit between (North Korea) and the United States of America, and thanks to your honest efforts. we were able to complete the preparations for the historic summit", Kim told Lee through an interpreter. And Secretary of State Mike Pompeo sought to keep expectations for the summit in check. Earlier this month, Singapore's defense minister said the USA trade threats were as disruptive to the global order as China's military deployments in the disputed South China Sea. Trump left the summit early, and as he flew to Singapore, he tweeted that he was yanking the US out of the group's traditional closing statement.
North Korean vice minister of foreign affairs Choi Sun-hee (third from left) arrives at the Ritz Carlton Hotel in Singapore to continue talks with the American ambassador to the Philippines, Sung Kim.
The president planned to stop in Guam and Hawaii on his way back to Washington.
Trump is set to meet with Lee on Monday.
Mr Trump, in his presidential state auto nicknamed The Beast, left the Shangri-La Hotel with his delegation at about 11.45am for the working lunch.
Trump had earlier tweeted about "excitement in the air!"
Tuesday's meeting will be the first between a sitting U.S. president and a leader of North Korea, whose nuclear and ballistic missile ambitions have raised global concerns and seen tensions soar. After their initial greeting, the leaders will head into a room for the summit. Or, it could amount to little more than a much-photographed handshake.
Kim met the Singaporean prime minister, Lee Hsien Loong, briefly on Sunday, smiling broadly as the two posed for photographs.