Nauert also dismissed doubts over North Korea's willingness to denuclearize amid news reports that suggested that Pyongyang seeks to deceive Washington about the number of nuclear warheads and existence of undisclosed facilities.
Secretary of state Mike Pompeo will travel to North Korea on July 5 to continue talks with Kim Jong-un's government on nuclear disarmament, the White House said Monday, even as new questions have been raised about Kim's intentions. "One, in the last eight months you haven't seen missile launches", she added, referring to North Korea's former habit of provocatively testing ballistic missiles. Secretary of State Mike Pompeo told reporters three weeks ago that the US wants North Korea to take "major" nuclear disarmament steps within the next two years - before the end of Trump's first term in January 2021. "All of Asia is thrilled", he said in a tweet.
The Middlebury Institute of International Studies report found that North Korea has recently expanded a factory complex in the eastern city of Hamhung that produces key engines for solid-fuel ballistic missiles.
Secretary of State Mike Pompeo reportedly is preparing for his third trip to North Korea later this week to discuss a proposed timeline for full denuclearization of the Korean peninsula.
Author Gordan Chang told Fox News: "Those satellite images taken from June 21, nine days after the summit show that they are improving the cooling system of the Yongbyon five-megawatt reactor and that clearly is inconsistent with the notion that they want to give up their weapons".
The president was referring to the talks that Sung Kim, the USA ambassador to the Philippines, and his delegation had with North Korean officials over the weekend in Panmunjom, a village on the demilitarized zone separating the two Koreas.
Heat warning extended until Sunday evening as scorching temperatures persist
Some patchy fog will be around during the morning hours as well for areas, so make sure to drive carefully. This weekend is so hot, that is can be downright risky ; otherwise its great to enjoy water activities.
"We have developed a program", said Bolton.
John Bolton, Trump's national security advisor, said on Sunday that the United States plans for North Korea to dismantle its chemical, biological, nuclear, and ballistic missile programs in a year's time.
Pompeo's visit comes days after the first in-person meeting between the USA and North Korea over the weekend.
But that vague statement bypassed crucial details about how and when North Korea would proceed with its denuclearization pledge.
The Washington Post reported Saturday that USA intelligence officials had evidence showing that North Korea does not intend to give up its entire nuclear stockpile, despite Trump's claim that there is "no longer a nuclear threat" from the country after the Singapore summit. "And the fact that our Secretary is now getting ready to go and have his fourth meeting with the North Koreans in less than three months I think is a testament to just how far we've come". "It seems that Donald Trump's attitude with Kim Jong Un is trust, trust, trust, trust and never verify". He said that would include transparency by North Koreans about the nuclear material they have, the engineering of it and the missiles that would deliver those nuclear weapons as well as other weapons of mass destruction. They also say the US has an unrealistic approach to North Korea's denuclearization. Over the weekend, a USA envoy met with the North Koreans at the DMZ.
Trump's words reversed his declaration upon his return from Singapore that North Korea had ended its nuclear ambitons.