Only the North Koreans and Secretary of State Mike Pompeo know what the president promised Kim Jong-un.
A senior official confirmed to DailyMail.com that the secretary of state was the only representative of the U.S. government who joined Trump in his meeting with Kim on Sunday in the DMZ.
'NSC staffed the President at the DMZ, but the sit down meeting was P+ Secretary, as prearranged with the North Koreans,' the person told DailyMail.com over email.
The president's national security adviser had insisted earlier in the day that NSC staff had never heard a desire from Trump to let Kim to keep his nuclear weapons.
But he was not on the trip, and no one from his staff was in the room, the source indicated.
A New York Times report characterized it as a 'nuclear freeze,' and said the position change has been kicked around in the administration for months.
John Bolton said in a Monday morning tweet that there had been no such discussion by anyone working at the White House and demanded consequences for the sources pushing the false claims.
'I read this NYT story with curiosity. Neither the NSC staff nor I have discussed or heard of any desire to 'settle for a nuclear freeze by NK.' This was a reprehensible attempt by someone to box in the President. There should be consequences,' he said.
The president's national security adviser says Donald Trump has never said he'd be open to allowing Kim Jong-un to keep his nuclear weapons
Trump did suggest he could loosen sanctions in a 45-minute, closed-door meeting with Kim on Sunday in the demilitarized zone that separates the two Koreas. He told reporters as much afterward
Bolton wasn't on the trip - he's seen here in Mongolia on Monday - but says it's never come up
Trump did suggest he could loosen sanctions in a 45-minute, closed-door meeting with Kim on Sunday in the demilitarized zone that separates the two Koreas.
'The sanctions remain but at some point during the negotiations things can happen,' he said.
He claimed that unspecified progress had been made in their third round of talks, which came after Trump invited Kim over Twitter to meet in neutral territory.
Their second summit fell apart without a new agreement, and North Korea has resumed weapons tests since the conversation in Hanoi.
Trump said Sunday that talks would be restarting, 'We are going to have teams, they are going to meet over the next weeks, they are going to start a process and we will see what happens.
His position throughout the administration has been the complete, verifiable denuclearization of the rogue nation under heavy U.S. and international sanctions for illicit nuclear tests.
Sources told the Times that Trump administration was considering a softening of its positions and the president could allow Kim, with whom he's become pen pals, to keep his nuclear arsenal if he promises not to use it.
Bolton refuted the claim on Twitter. He said neither he nor anyone else at the National Security Council, NSC, had heard it discussed.
It remained unclear on Monday morning whether anyone from NSC was in the room with Trump and Kim when they held their private talk, moments after Trump became the first sitting president to enter North Korea.
Bolton was on other travel at the time. He was not on the president's trip to Seoul and did not participate in his field trip to the DMZ and North Korea. It is not known whether an NSC aide was in the room with the president when he met Kim at all.
A spokesperson for the NSC did not immediately respond to a request for clarification.
Trump came out of the meeting raving about his relationship with Kim. He said he could have the North Korean leader who's barred from coming to the U.S. unless an exception is created at the White House in Washington.
The visits are typically reserved for U.S. allies and doled out infrequently to anyone outside of Group of 20 leaders.
As he arrived at the White House residence on Sunday evening, President Trump ducked a question from DailyMail.com on the timing of Kim visit.
Kim told Trump earlier in the 30-hour day that started in Asia and ended in the U.S. that he was 'very courageous' for crossing the demarcation line and coming to the North.
'This has a lot of significance because it means that we want to bring an end to the unpleasant past and try to create a new future, so it's a very courageous and determined act,' Kim told Trump through a translator after smiling during their initial handshake greeting. 'You're the first U.S. president to cross this line.'
U.S. President Donald Trump meets with North Korean leader Kim Jong Un at the demilitarized zone separating the two Koreas, in Panmunjom
Kim Jong Un and Donald Trump shake hands during a meeting on the south side of the Military Demarcation Line
Trump invited Kim to meet him for a handshake in a tweet that came amid his trip to Japan for the G20.
He claimed he just thought of it, even though reports had been circling for weeks that he'd like to meet Kim, and he told