Donald Trump tells Guam missile threat will be great for tourism

US President Donald Trump has told Guam's Governor North Korea's plan to launch a missile strike near the small pacific island has made the nation "extremely famous".

On a speaker-phone call posted to Facebook by Guam's Governor Eddie Baza Calvo, the President is heard saying the potential strike would boost tourism.

"Tourism, I can tell you this - tourism you're going to go up like ten-fold with the expenditure of no money, so I congratulate you."

"You've become extremely famous - all over the world they're talking about Guam, and they're talking about you."

North Korea has announced a plan to launch missiles into the sea about 40 kilometres off the coast of Guam - a US pacific territory, major military hub and home to US bombers.

Mr Trump said he was with Guam "a thousand percent".

"You are safe. We are with you a thousand percent.  We're going to do a great job so don't worry about a thing."

Mr Calvo said he had "never felt so safe" with Mr Trump in charge.

"I have never felt more safe or so confident with you at the helm, so with all the criticism going on over there we need a president like you. So I'm just so thankful and glad you're holding the helm."

Mr Calvo said the country at present had 95 per cent (hotel bed) occupancy, "and after all this stuff comes down we're going to have 110 percent occupancy".

Mr Calvo criticised the widespread critique of Mr Trump, to which Mr Trump said, "they should have had me in years ago - frankly, you could have said that for the last three presidents."

Before speaking to Mr Calvo, Mr Trump told reporters in New Jersey that he believed Guam would be "very safe" and threatened North Korea with "big, big trouble" if it launched an attack.