The senior official from Donald Trump’s White House administration claimed “preliminary signs” shown, which could mean Kim Jong-un is plotting to launch another missile.
They also said Donald Trump is planning to be “more discreet” when talking publicly about US military exercises with South Korea and Japan.
The US has held several exercises with its allies on North Korea’s border, as a show of strength to despot leader Kim Jong-un.
North Korea replied by suggesting Donald Trump and his US forces are only increasing the possibility of World War 3.
But now it is believed Pyongyang could once again be gearing up for a missile launch, whether it be an ICBM test or an attempt to put a satellite into orbit.

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CNN Pentagon correspondent Barbara Starr said: “Multiple officials tell us North Korea is moving equipment around.
“They are not able to tell us exactly what kind of equipment, but it is the kind of thing making them watch for the possibility, in the coming days or weeks, of another missile launch or even a satellite launch.
“It’s simply too soon to say exactly what the North Koreans may be up to.”
Experts now fear that North Korea could also be attempting to create an arsenal of Anthrax warheads to attach to its planned ICBMs.
Hoover research fellow Lanhee Chen has warned “it’s very easy” for Kim Jong-un to create the deadly bacteria and there are already signs showing he is well on his way.
Mr Chen said: “In fact, a lot of analysts looked at this and said, ‘Hey, in fact, we have evidence, credible evidence, the North Koreans are pursuing some kind of biological weapons capability’.”
Mr Chen added that Anthrax has been found in the blood of North Korean defectors.
Anthrax has been used a biological weapon throughout the 20th Century as it is spread easily by breathing in spores in the air.
He said: “If you add to that the fact that we have defectors coming over from North Korea to South Korea that test for the Anthrax antibody in their bloodstream.
“In other words, they’ve either been vaccinated against Anthrax or been exposed to the Anthrax virus or Anthrax bacteria rather, this a very serious situation.
“One that clearly indicates that they mean business.”