Then Trump, ever the businessman, started talking about how good this situation will be for Guam's tourism industry.
"So, with all the criticism going on over there for a guy who's doing what's positive, we need a president like you".
"I just wanted to pay my respects [and say] you are safe", Mr Trump began the call.
Trump, and Chief of Staff General John Kelly, phoned Guam's governor Eddie Baza Calvo to assure him that the people of the country are safe and that the president is behind the them "1000 percent".
"We are with you a thousand percent", Trump said, according to video of the call posted on Calvo's Facebook page. "I have to say, Eddie, you're going to become extremely famous". And I wanted to call you and say hello. Lt. Gov. Ray Tenorio (R-Guam) told the FOX Business Network's Maria Bartiromo of Mornings with Maria, that though they have not been in direct contact with President Trump about the threat, "We are in communication with the Department of Defense, through the Joint Region Marianas, we're in contact with the military leaders here, Admiral Chatfield of the U.S. Navy and of course are corresponding with our civil defense and Homeland Security". "It just looks like a lovely place", he said.
"All over the world, they're talking about Guam, and they're talking about you, and I think tourism, I can say this, your tourism, you're going to go up like tenfold with the expenditure of no money, so I congratulate you".More news: North Korea knows United States 'fire, fury' very well
But the newly released fact sheet, entitled "Preparing for an Imminent Missile Threat", makes an abstract worry more concrete.
The president called the U.S. military "incredible, "rock solid" and "the best in the world by a factor of five".
The Government has instructed residents to be proactive and create emergency supply kits, a family emergency plan and a list of concrete shelters in their vicinity.
Trump reciprocated the sentiment and suggested that the stalemate between the USA and North Korea could have had a different outcome, had he been the president in years past.
Mr Trump has said he would not allow Pyongyang to develop a nuclear weapon capable of hitting the United States.