He told the governor that when it came to Guam, "we are with you 1000%".
"Well, we're going to do a great job here, don't worry about a thing", Trump replied. During the conversation Trump also noted how much everyone around the world is talking about and focused on Guam after the missile attack threats by North Korea. "It just looks like a lovely place", Trump said.
Calvo concurred, giving Trump a tourism pitch and describing it as "paradise".
As tensions continue to rise between the United States and North Korea, folks are suddenly remembering that even if the DPRK can't strike the continental US, if they really wanted to, they could cause problems for our allies and territories. "We've got 95 per cent occupancy and after all this stuff comes down we're going to have 110 per cent occupancy".
President Donald Trump is warning of severe consequences if North Korea attacks Guam.
"Mr President, as the governor of Guam, representative of Guam's people, and as an American citizen, I felt never more safe and so confident with you at the helm", the governor said with a smile.
"Lie flat on the ground and cover your head. I wanted to call you and say hello, how are you?"
He then reassures Mr Calvo, who he describes as a "hell of a guy", telling him the USA military is "rock solid".
Trump has been escalating his rhetoric against North Korea, but says he hopes "it will all work out".
Tension in the region has risen since North Korea carried out two nuclear bomb tests previous year and two intercontinental ballistic missile tests in July.
On Wednesday, Mr Trump followed up his "fire and fury" warning with a boast about United States nuclear capabilities.