After his inauguration, the president ordered a review of the nation's arsenal to ensure that U.S. capabilities were modern and robust, but the White House has not detailed any findings from that investigation.
President Trump tweeted today: 'Hopefully we will never have to use this power, but there will never be a time that we are not the most powerful nation in the world'.
Guam lies about 2,100 miles from the Korean Peninsula, and it's unlikely Kim's government would risk annihilation with a pre-emptive attack on USA citizens.
"The president spoke to him, to Kim Jong-un, in a that language Secretary [of State Rex] Tillerson has said, and said this morning, is the kind of language Kim Jong-un will understand", Nauert said.
Ironically, much of the modernization was set in motion under President Barack Obama, who was a lifelong opponent of nuclear weapons, negotiated New START and became the first sitting president to visit Hiroshima, site of the world's first nuclear attack by the United States in World War II.
The threatened attack near Guam, if carried out, would be the North's most provocative missile launch to date.More news: Illness count rises at World Championships amid norovirus outbreak
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He downplayed speculation that the threats move the USA closer to a military option.
Cheney said in an interview Thursday that Trump's comments earlier this week that the North Korean regime of Kim Jung Un would face "fire and fury" if it continued to threaten the United States were justified.
After Trump spoke, apparently in response to US military exercises near North Korea, the Pyonyang government warned it was considering a military strike against the United States' Pacific island territory of Guam. He also said that he hopes the United States will never have to use its nuclear weapons.
The senator also dismissed Secretary of State Rex Tillerson, who is the former CEO of Exxon Mobil.
North Korea, no stranger to bluffing, frequently uses extremely bellicose rhetoric with warnings of military action to keep its adversaries on their heels.
Speaking earlier today on his way home from Asia, he credited Trump with sending a strong message to the North Korean leader on the "unquestionable" USA ability to defend itself, so as to prevent "any miscalculation".
"This pressure campaign with North Korea is something we are all in agreement on", she said. But Tillerson told reporters that nothing he's seen or knows of in the last day dramatically changed the situation.