© CNA / ReutersKim Jong Un watches the launch of a Hwasong-12 missile in this undated photo released September 16, 2017.
During an interview with ABC News on Sunday, Pompeo, who secretly met with Kim Jong-un in Pyongyang as CIA director earlier this month, said there is a "real opportunity" for a denuclearisation deal between President Trump and the North Korean leader when they meet next month.
Pompeo said he met with Kim under clear instructions from Trump to discuss a way to verify if the Korean peninsula had denuclearized, adding that the administration has its "eyes wide open."
"We use the word 'irreversible' with great intention," Pompeo said. "We are going to require those steps that demonstrate that denuclearization is going to be achieved."
US National Security Adviser John Bolton said in a separate interview with Fox News that a 2003 agreement to eliminate the Libyan weapons of mass destruction programme could serve as a model for the North Korea negotiations.
Libyan leader Muammar Gaddafi agreed to dismantle the programme in exchange for the lifting of sanctions placed on the country by Western powers. At the time, international inspectors from the US and the UK verified that Gaddafi followed through on the agreement.
"We have very much in mind the Libya model from 2003, 2004. There are obviously differences. The Libyan programme was much smaller, but that was basically the agreement that we made," Bolton said.
North Korea is planning to close its nuclear weapons test site in May and give South Korean and US experts and the media access to the process, the latest statement from Seoul said, following the meeting between North Korean leader Kim Jong-un and South Korean President Moon Jae-in on Friday.
Comment: Libya's denuclearisation may have been a success, but the U.S. and NATO exploited the fact be then destroying the country. Is that the model they want to follow?