U.S. President Donald Trump is casting doubt on the potential US-DPRK summit. Currently hosting South Korean President Moon Jae-in at the White House, Trump did little to quell speculation about the wavering prospects. Moon is in Washington trying to keep the planned summit on track. But the meeting is shrouded by a cloud of doubt following the Trump administration's comments comparing the DPRK's weapons program to Libya. CGTN White House correspondent Nathan King reports.

Two presidents and allies sitting together but not talking the same language when it comes to the planned summit. US President Trump suggested a possible delay in the upcoming meeting even as South Korea's President Moon talked as though the Singapore summit was still on track.

DONALD TRUMP US PRESIDENT "There are certain conditions that we want. And I think we'll get those conditions. And if we don't, we don't have the meeting. If it doesn't happen maybe it'll happen later. Maybe it'll happen at a different time. But we'll see."

INTERPRETER FOR PRESIDENT MOON JAE-IN "We're looking forward to the first ever U.S.-North Korea summit and we find ourselves standing one step closer to the dream of achieving complete denuclearization on the Korean Peninsula and world peace."

Trump talked of a changed attitude from the DPRK about getting rid of its nuclear weapons, even at one stage pointing the finger at China, suggesting something may have happened at the second meeting between President Xi and Kim Jong-un. but for both the DPRK and South Korea, Pyongyang's recent reticence stems from this man, US National Security Adviser John Bolton, who compared the current negotiations with the DPRK to those with Libya, which gave up its nuclear weapons research in 2003. Libya's leader Muammar Gaddafi was overthrown and killed in 2011. Well, the DPRK reacted angrily to that comparison. Last week, a top DPRK official issued this statement.

This is not an expression of intention to address the issue through dialogue. It is essentially a manifestation of awfully sinister move(s) to impose on our dignified state the destiny of Libya or Iraq, which had been collapsed due to the yielding of their countries to big powers.

And it's not just the DPRK, this from a former South Korean unification minister and lawmaker in Moon Jae-in's party: There are several landmines on the way to the summit between North Korea and the US. One of those landmines just exploded: John Bolton.

U.S. President Trump is rejecting the Libya model and said Tuesday that he was prepared to guarantee Kim Jong-un's safety if a deal was reached. But just three weeks from the planned summit, there are still deep differences about how any deal would be negotiated. The White House wants the DPRK to permanently scrap its nuclear weapons before lifting any sanctions. Pyongyang and Seoul prefer a step by step approach that will build trust on both sides. Nathan King, CGTN at the White House.