The North's official KCNA news service, for its part, accused Trump in an editorial of "driving the situation on the Korean peninsula to the brink of a nuclear war", calling the U.S. But then the conversation took a odd turn when Donald Trump took the opportunity to throw shade on President Obama and assure Calvo that this standoff is actually great for Guam's tourism economy.
"I just wanted to pay my respect", Trump said to Calvo over the phone. "Radioactive fallout poses the greatest threat to people during the first two weeks, by which time it has declined to about 1 per cent of initial radiation level".
Governor Calvo said "as the head of the government of Guam, I appreciate [the US government's] reassurances that my family, my friends, everyone on this island, are all safe". It looks lovely, you know I'm watching...it's such a big story in the news.
The White House says Trump also told Xi he looked forward to seeing him in China later this year. "But you're going to be taken care of".
Key Pyongyang ally Beijing, meanwhile, has pleaded with Trump to tone down his rhetoric to prevent tensions from boiling over.
"You've become extremely famous".
Residents of the USA island of Guam say they're anxious but overall "unworried" amid missile threats from North Korea.
But Mattis has urged a more peaceful resolution, saying: 'The American effort is diplomatically led, it has diplomatic traction, it is gaining diplomatic results and I want to stay right there right now.More news: Donald Trump responds to Barcelona attack with reviving 'Internet rumor'
"It looks like a attractive place", Trump added.
Calvo agrees, saying, "It's paradise".
On Thursday, Trump told reporters: "He does something in Guam, it will be an event the likes of which nobody has seen before, what will happen in North Korea".
Savage, the author of the best-selling "Trump's War: His Battle for America", noted Kim's threats are more than just talk, "he's actually been firing missiles". "But you're not going to have a problem".
"Let her speak for Germany", Trump said, when asked about the comment.
The pair then spoke about partisanship in the nation's capital.
Calvo concurred, giving Trump a tourism pitch and describing it as "paradise". "This is a time of threat to the United States. It should be everybody unifying behind our president".
Trump understands China's efforts to resolve the issue, the report said, and both leaders agreed to keep in close contact. But regardless, our military is so incredible, and there's no partisanship there, believe me. "We are rock solid and we are the best in the world".