According to NBC, which spoke to USA officials familiar with intelligence assessments of North Korean denuclearization, the Kim regime has only stopped its missile and nuclear tests.
This is used for nuclear weapons, adding to doubts Pyongyang is not fully committed to denuclearisation.
The U.S. State Department said here Tuesday it will not provide a timeline for the abandonment of nuclear and missile program of the Democratic People's Republic of Korea (DPRK).
Trump reiterated in an interview broadcast Sunday that he thinks Kim is serious about denuclearization.
"There's no evidence that they are decreasing stockpiles, or that they have stopped their production", one unnamed USA official briefed on the latest intelligence told NBC News last week.More news: Iran's Rouhani terms USA threats to end oil imports as a "fantasy"
Harry Kazianis, Executive Editor of The National Interest and Director of Defense Studies at the Center for the National Interest, says it seems the North Koreans "don't have any intention of denuclearizing".
The images showed North Korea finishing construction on the exterior of the plant around the time Kim was meeting with Trump, the report said.
Appearing on CBS's Face the Nation, Bolton said he did not want to comment on the reports or on "anything related to intelligence" - NBC having quoted more than a dozen senior USA intelligence officials and the Post four.
USA intelligence officials have separately concluded that Kim was seeking to hide his nuclear weapons stockpile and had no intention of surrendering his arsenal, NBC News reported.More news: Juventus Make Stunning Official Bid To Sign Cristiano Ronaldo From Real Madrid
Bolton told CBS's Face the Nation that Washington has devised a programme to dismantle North Korea's weapons of mass destruction and ballistic missile programmes in a year.
AXIOS reported the two leaders could possibly meet again in New York City during the fall when world leaders are expected to pour into town for the U.N General Assembly.
Less than three weeks ago, Pompeo said the United States wanted North Korea to take "major" nuclear disarmament steps within the next two years - before the end of Trump's first term in January 2021.
After promising as a candidate that he would be happy to talk to the North Korean dictator and would "absolutely" try to talk some sense into Kim Jong-un, President Trump began his outreach to him with a series of insulting tweets. "I will just say this: Not answering the specific reports we've seen over the weekend ... we are using the full range of our capabilities to understand what North Korea is doing".
"If they have the strategic decision already made to do that and they are cooperative, we can move very quickly", Bolton said. Collins stressed the need for "verifiable, unimpeded, reliable inspections" of the North's weapons programs.More news: Prime Day returns on July 16th, deals are starting now
"I don't want a war with North Korea", Graham said. "Let them discuss these issues and see exactly where there might be room for progress or where we find there is no room at all".