"We are with you 1,000 percent" via phone on Friday.
"You've become extremely famous", he told Mr Calvo of the global news coverage following North Korea's threat. "All over the world they are talking about Guam, and they are talking about you".
Pyongyang said this week it is planning to launch four missiles into waters near the coast of Guam, which is a major United States military hub with a population of 163,000 - all of whom are technically U.S. citizens.
The plan calls for missiles to be fired into the sea about 40 kilometres from the coast of Guam.
Mr Calvo agrees: "It's paradise".
And he told the former hotel magnate, "We have 95 percent occupancy and after all of this stuff calms down we're going to have 110 percent occupancy".
The reason, of course, that Guam is in the news is because of Trump's threats regarding North Korea..
"If caught outside, do not look at the flash or fireball - It can blind you. But you're going to be taken care of".
Visitors to the Homeland Security website are also directed to an American Red Cross guide on how to "shelter-in-place" during a chemical or radiation emergency.
The President said he wanted to give his "highest respect and regards" to the people of Guam and that the military is rock solid "we've got the best in the world", he added.
"They should have had me eight years ago, or at least somebody with my thought process", Trump said, alluding to President Obama.
Then Trump, ever the businessman, started talking about how good this situation will be for Guam's tourism industry. It's such a big story in the news, it just looks like a handsome place.
If correct, and if the USA allows the missiles to launch in the first place, that leaves 17 minutes for tracking stations on land and sea - including the Pine Gap facility near Alice Springs - to calculate, target and try to destroy the missiles.
Tensions have escalated between the US and North Korea as the communist regime continues testing and expanding its nuclear program, reporting this week that it can now fit nuclear warheads on missiles.
"I wish there would be less partisanship up there, this is a time of threats to the United States", said Calvo.
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.