Trump, meanwhile, said North Korean leader Kim Jong Un has been "very threatening beyond a normal statement" and vowed strong repercussions if the nuclear threat continues. "They will be met with fire and fury like the world has never seen", Trump told reporters at the Trump National Golf Club in Bedminster, New Jersey.
One intelligence official said that the report itself was insignificant and not a sign that North Korea was preparing to test a missile or make any other provocation.
The revelation comes a day after North Korea said it would launch "thousands-fold" revenge against the United States over the adoption of tough UN sanctions imposed after its intercontinental ballistic launches.
Even fewer - 11 percent - say they'd be willing to accept a deal that would allow North Korea more nuclear weapons. North Korea has conducted five nuclear tests since 2006, with the most recent occurring September 9, 2016.
The U.S. -drafted resolution bans North Korean exports of coal, iron, iron ore, lead, lead ore and seafood following Pyongyang's two intercontinental ballistic missile tests in July.
Georgian soldier killed, 2 Americans wounded in latest Afghan attack — U.S. military
Trump, according to the NBC report , also said he was considering firing the commander of us troops in Afghanistan, Army Gen. The incident is still under investigation and a joint USA and Afghan delegation earlier visited the area.
North Korea says that new sanctions imposed by the UN Security Council were "unwarranted and unfair".
Officials in the USA believe North Korea has up to 60 nuclear weapons.
The Fox News report, which was about USA spy satellites detecting North Korean missile movements, included quotations from officials who requested anonymity to discuss sensitive information.
North Korea has long accused the United States and South Korea of escalating tensions by conducting military drills.
The Trump administration has sought to put pressure on China, claiming that Beijing could stop North Korea if it wanted to, through blocking all economic transactions with its neighbor. "We must be tough & decisive!", the U.S. leader wrote on Twitter.
Despite the United States' insistence that North Korea halt its missile tests, US spy agencies detected the rogue communist regime loading two anti-ship cruise missiles on a patrol boat on the country's east coast just days ago.