Trump's June nuclear summit with Kim yielded no specifics on how North Korea would achieve denuclearization.
A team of U.S. officials led by envoy Sung Kim met with North Korean officials Sunday at Panmunjom, the border village between North and South Korea in the demilitarized zone, senior State Department officials told CNN. "Only the Opposition Party, which includes the Fake News, is complaining".
The White House declined to comment on the report.
The United States has a plan that would lead to the dismantling of North Korea's nuclear weapons and ballistic missile programs in a year, President Donald Trump's national security adviser said, although US intelligence reported signs that Pyongyang doesn't intend to fully give up its arsenal.
The State Department's refusal to specify a timeframe could be meant to lower expectations for the outcome of Pompeo's visit to Pyongyang, experts say.
Both meetings discussed the denuclearization of North Korea as a path to peace in the region.
The Washington Post reported USA intelligence officials believe North Korea does not intend to fully give up its nuclear stockpile.
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The North Koreans should know what to expect in these meetings, Nauert added: "We've had very clear conversations with them".
The surprising news comes just two days after NBC News reported that North Korea is ramping up its nuclear development at "secret sites" instead of shutting down its nuclear operations.
The satellite images, taken by San Francisco-based Planet Labs Inc. and analyzed by researchers at the Middlebury Institute for International Studies (MIIS) in Monterrey, show Pyongyang finishing construction at the Chemical Material Institute, which researchers say is based in the North Korean city of Hamhung.
He added: "It seems that Donald Trump's attitude with Kim Jong Un is trust, trust, trust, trust and never verify".
Donald Trump said on Sunday it was "possible" that a deal he claimed ended the nuclear threat posed by North Korea would not "work out".
Wednesday (July 4) marks the first anniversary of North Korea's test-firing of its first intercontinental ballistic missile (ICBM) capable of reaching Alaska.
The factory in question produces wound-filament airframes and nozzles for engines used in solid-fuel missiles, particularly the Pukguksong series of rockets, the report said.
US officials also said they were not convinced that North Korea was stopping missile production and testing.