North Korea said on Saturday that almost 3.5 million workers, party members and soldiers volunteered to join or rejoin its army to resist new U.N. sanctions and to fight against the United States in the current geopolitical tension between Pyongyang and Washington, Reuers reported.
"While we have heard threats like this in the past, I take them very seriously and continue to engage with our DOD partners to ensure that Guam and our people remain safe", she said, adding that Trump's statements "concerning and unhelpful".
Guam's Homeland Security Adviser George Charfauros said Friday it would take 14 minutes for a missile fired from North Korea to reach Guam.
The territory of Guam has US military bases and is the closest USA area to North Korea, which has threatened to attack the Pacific island.
The long-standing tensions between the nations have escalated after both performed missile tests and new UN sanctions were imposed against North Korea at the weekend.
The American president continued his belligerent rhetoric against the North on Friday, tweeting, "Military solutions are now fully in place, locked and loaded, should North Korea act unwisely".
Trump has alternately praised and chided China for the efforts to contain its rogue neighbor.
"North Korea raising tension (on the Peninsula) is a serious challenge against the South Korean-US alliance and the global community".
The possibility of escalation is made even more acute by the lack of any means of official communication across the Demilitarized Zone, though there has been no easing of the barrage of inflammatory comments in the USA and the North since new sanctions against North Korea were announced last week.
The country has threatened nuclear attacks against the US and its allies as well as a missile strike on Guam. State-run media ensures that the population gets the North Korean side of the story, but doesn't convey any sense of global concern about the situation.
It is considering firing medium to long-range ballistic missiles to create an "enveloping fire" to contain United States air bases on the island, which lies around 1,500 miles south of Tokyo in the Pacific Ocean. Accusing his predecessors of insufficient action, Trump said it was time somebody stood up to Kim Jong Un.
According to its reported plan, North Korea would fire four Hwasong-12 intermediate-range missiles over Japan and into waters around Guam, home to about 7,000 troops and 160,000 people.
US officials say they will be going ahead with long-scheduled military exercises with South Korea. In a statement this week, Bordallo called North Korea's threat to target Guam "dangerous", saying she has discussed threats with Mattis and other defense leaders, who have "consistently reassured me that Guam is protected".
"They will be met with fire and fury like the world has never seen..."