US Secretary of State Mike Pompeo congratulated Harry Harris, 61, in a tweet published on Saturday afternoon, saying that "a lot of work ahead" waiting for Harris, including the denuclearisation of the Korean Peninsula.
Harris, who previously served as the commander of US Pacific Command, was confirmed by the Senate on Thursday.
Officials from North Korea and the U.S.
Appearing on CBS's Face the Nation, Bolton said he did not want to comment on the reports or on "anything related to intelligence" - NBC having quoted more than a dozen senior U.S. intelligence officials and the Post four.
"North Korea remains free to manufacture more nuclear weapons, ballistic missiles and other weapons of mass destruction - even though it has unilaterally frozen testing of its nuclear weapons and certain ballistic missiles", he said.
North Korea is completing a major expansion of a key missile-manufacturing plant, said researchers who have examined new satellite imagery of the site the latest sign Pyongyang is pushing ahead with weapons programs even as the US pressures it to abandon them.
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The NBC report quoted USA officials who said they believe that North Korean leader Kim Jong-un might try to hide the facilities as he seeks more concessions in nuclear talks with the US. Then on Sunday night, the Wall Street Journal reported that researchers have determined that North Korea is rapidly completing a major expansion of a key missile-manufacturing facility - one that produces reentry vehicles and solid-fuel ballistic missiles created to enable nuclear strikes with greater surprise or at greater distances.
"If they have the strategic decision already made to do that and they're cooperative, we can move very quickly", he said. "Physically we would be able to dismantle the overwhelming bulk of their programmes within a year".
The reports of Pyongyang's "business-as-usual" nuclear program come despite Trump's post-summit boast that North Korea was "no longer" a nuclear threat. "I really believe he means it", the president said on Fox News Channel's "Sunday Morning Futures with Maria Bartiromo". Now, is it possible--have I been in deals, have you been in things where people didn't work out? "We can talk. He has a big heart", he said, according to the sources.
"We know exactly what the risks are, of them using negotiations to drag out the length of time they have to continue their nuclear, chemical, biological weapons programs, ballistic missiles", Bolton said. North Korea has great potential for the future! "We have a very good chemistry", he added.
The activity by the North is in sharp contrast to Kim's actions before the summit, when he destroyed several nuke facilities. He spoke with the foreign ministers of China, Japan and South Korea in recent days about the situation with the North, according to the State Department, which has declined to comment on any upcoming travel.
But Pyongyang has kept its counsel on the denuclearization issue since the meeting.