Some 3.5 million North Korean citizens have signed up to enlist in the army to fight against the U.S., as tension between Washington and Pyongyang continues to mount, state-media reported on Saturday.
The North has threatened to fire ballistic missiles over Japan toward the tourism-dependent idyllic island, as Pyongyang and Washington ratchet up their war of words.
A statement by North Korea's official KCNA news agency issued on Saturday said the Trump administration "had better talk and act properly", if it did not want "the American empire to meet its tragic doom". "And with me, he's not getting away with it".
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"Speaking alongside Vice President Mike Pence at his New Jersey country club, Trump also said China could do "a lot more" to pressure Pyongyang to end its nuclear weapons program".
American and South Korean officials said they would move forward with large-scale military exercises later this month that North Korea calls a rehearsal for war.
President Trump assured Mr Calvo that Guam is safe during a phone call. Tillerson added that Trump was making the consequences clear should North Korea attack the US.
In an earlier call, White House Chief of Staff John Kelly told Calvo: "We are all over this. Is the USA gonna go to war?"
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Striking a similar tone with his top diplomat, Secretary of State Rex Tillerson, Trump said the USA will "always" consider negotiations with the reclusive regime.
The warning comes after Kim threatened the USA this week to fire missiles at Guam after the U.S. sponsored a resolution imposing new economic sanctions on Pyongyang over its missile and nuclear weapons programmes.
Japanese media saidTokyo was deploying its Patriot missile defence system following Pyongyang's threat to fire ballistic missiles over the country towards Guam.
Guam is home to about 163,000 people and a U.S. military base that includes a submarine squadron, an air base and a Coast Guard group.
President Donald TrumpsaidFriday that North Korea would "truly regret" any overt threat or action toward Guam or other US territories, participated in a discussion on apprenticeships and has a 5 p.m. eastern meeting scheduled with USA ambassador to the United Nations Nikki Haley and Secretary of State Rex Tillerson.