The Guam leader thanked Mr Trump for his efforts and said he had "never felt more safe". In the President's words they are behind us "1000 percent."As the head of the Government of Guam, I appreciate their reassurances that my family, my friends, everyone on this island, are all safe".
He told Calvo: "You notice that he hasn't spoken recently?"
North Korea said it was finalising plans to fire four intermediate-range missiles over Japan to land 30-40 km (18-25 miles) from Guam, adding detail to a plan first announced on Wednesday.
Trump continues, "This is between you and I, but you don't talk like they talk, you can't do that, and you can't do that with people like us".
Trump opened the conversation by telling Calvo, " Good morning, good morning.
This is not to say that North Korea will not respond to President Trump's remarks with plenty of blood-curdling threats, but it is important to note that the threat universally cited by the mainstream media as Kim Jong-un's terrifying push back against Trump's bluster was, in fact, a threat issued for entirely different reasons - both of them involving American military forces located on US soil. "You are safe, we are with you 1,000%".
In a separate interview, Secretary Delfin Lorenzana of the Department of National Defense admitted the government was watching with concern the rising tension between the United States and North Korea. And I wanted to call you and say hello.
"You've become extremely famous", Trump said. "This is a time of threat to the United States".
"And your tourism, I can say this, your tourism is going to go up like tenfold with the expenditure of no money, so I congratulate you", Mr Trump said, praising the island's beauty, to which Mr Calvo encouraged Mr Trump to visit.
"Don't worry about a thing", Trump said.
Guam's Office of Civil Defense started passing out flyers on Friday to help residents prepare for a missile attack from North Korea.. Asked if the US was going to war, he said cryptically, "I think you know the answer to that".
The statement said that in the event of a strike, people "should 'take cover, take shelter immediately, not look towards what could be the blast area in fears of being blinded, '" Almaguer said.