The president responded, “You just went to 110, I think.”
Efforts to reach the White House on Saturday were not immediately successful.
Guam’s $5 billion economy is fueled mainly by tourism and the United States military, which occupies about 30 percent of the island and is looking to expand. The island, roughly the size of Chicago and home to about 160,000 people, is about 2,200 miles southeast of North Korea.
The conversation, in which both men praised each other, differed drastically from Mr. Trump’s contentious calls with leaders of Australia and Mexico in the early days of his administration. Transcripts of those calls were leaked this month.
“We are with you 1,000 percent,” Mr. Trump said in the call to the governor of Guam.