After the Singapore summit, which also saw the United States offer "security guarantees" to North Korea and promise to end its military drills with South Korea, Mr Trump claimed that the North no longer posed a nuclear threat. You asked Pompeo: "'Did he sleep well?' If you knew what I knew about what we could do to the leadership of North Korea, you wouldn't sleep very well", Graham said.
Seoul and Washington said in June they would halt the joint exercise after U.S. President Donald Trump pledged to end war games following his summit with North Korean leader Kim Jong Un in Singapore on June 12. This miracle can be yours.
Pompeo's visit to North Korea has led to the launch of working groups to deal with details such as verification.
Many analysts, like Countryman, were skeptical that any real progress had been made between the two countries after the vague language of the summit agreement became public. "It's a very, very unrealistic plan", Sue Mi Terry, Korea an analyst for the Center for Strategic and International Studies and former Central Intelligence Agency analyst, told Morning Edition on Friday, adding that just the process of verifying the full scope of North Korea's nuclear program "takes years, decades".
Pompeo downplayed North Korea's criticism on Sunday, telling a reporter that Pyongyang did not have an issue with the idea of complete, verifiable and irreversible denuclearization - a term better known by its acronym, CVID - despite the North Korean Foreign Ministry singling out the phrase in its statement.
The statement was sure to fuel growing skepticism in the USA and elsewhere over how serious Kim is about giving up his nuclear arsenal.
As he departed Pyongyang, Pompeo said he spent "a good deal of time" discussing a denuclearisation timeline and the declaration of North Korea's nuclear and missile facilities. "People are going to make certain comments after meetings".
Pompeo was in Vietnam's capital to meet with the Vietnamese leadership and discuss North Korea following two days of frosty talks in Pyongyang aimed at persuading leader Kim Jong Un to give up nuclear weapons. But following the stinging commentary from the North, he allowed that much work remains.
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But no details were announced on how or when the reclusive state would dismantle its nuclear program, and Pompeo said he would aim to "fill in" details on the Singapore agreement.
"We still have a long ways to go, but the commitment that the North Koreans made, that frankly Chairman Kim personally made to President Trump remains, has been reinforced", Pompeo said.
The two sides also failed to make concrete progress on the return of the remains of US soldiers killed during the 1950-53 Korean War and the demolition of the North's missile launch site in Tongchang-ri.
Graham, who is known for his hard-line stance, also warned the North not to test the Trump administration's resolve.
Yet three weeks later, the two sides were still divided on all the issues, including exactly what denuclearization means and how it might be verified. The promised remains have yet to be delivered.
The North's spokesman said: "We expected that the US side would come with productive measures conducive to building trust in line with the spirit of the North-US summit and (we) considered providing something that would correspond to them".