And within striking range of North Korean missiles.
He adds, "if anything happens to Guam, there's going to be big, big trouble in North Korea". Guam is home to a U.S. air base, a Navy installation, a Coast Guard group and roughly 6,000 USA military personnel.
Trump has been escalating his rhetoric against North Korea, but said he hopes "it will all work out".
"For me because I'm a father, so it's really concerning, you know, I wish it didn't have to come to that", he said.
It was not the first time Guam has been put on notice and similar threats made since 2013 led to the USA military permanently deploying a Terminal High Altitude Area Defense (THAAD) interceptor system on the tiny island. It has a population of around 163,000 - comparable to a small city in the Midwest.
Earlier this week, nuclear-armed North Korea threatened to strike the United States and its Pacific territory of Guam.
At the time North Korea said it was launching a telecommunications satellite, but Washington, Seoul and Tokyo believed Pyongyang was testing an intercontinental ballistic missile.
Guam is about 2,100 miles southeast of Pyongyang, and 3,800 miles west of Honolulu.
Jacob Martinez, 29, a purchasing officer at a high-end hotel, said he was frustrated that Guam, an island smaller than Singapore and about 11,000 km away from the USA mainland, might be dragged into a major conflict. Chamorros are the indigenous people of Guam.
There's a sense of patriotism among those who cite the island's history of Guam residents serving in the US military.
Officials haven't raised the USA territory's threat level even after Pyongyang laid out plans to strike near the island in the coming weeks, Guam Gov. Eddie Calvo said.
A resident buys bottles of water at Home Depot in Guam Saturday, Aug. 12, 2017.
The archdiocese also asked Catholics to "pray that the Holy Spirit will instill in the leaders of our country and all nations the virtues of wisdom and understanding to promote peace rather than war".
Military officials say they plan to move ahead with large-scale U.S. Calvo stressed in a statement that there was no imminent threat to the safety of residents or visitors.
"We are concerned about these threats but at the same time we also want to make sure people don't panic and go on with their lives".
"It's just like setting off fireworks because most of their guided missiles just crash midway through flight", she said. She noted that similar threats in 2013 led to an advanced missile defense system - known as THAAD, for Terminal High Altitude Area Defense - to be permanently placed on the island as a deterrent.
Asked if the US was going to war, he said cryptically, "I think you know the answer to that".
Whatever their doubts about those on the world stage, some local residents seemed to have more confidence in their local leaders.