Trump responded to that development by threatening to unleash "fire and fury" on North Korea if it continued to threaten the U.S. Since then, Trump has exchanged threats with North Korea, which said Wednesday that its military would have plans in place by mid-August to attack waters near the U.S. territory of Guam.
Asked if "threats alone" would be enough for the United States to retaliate militarily, McMaster said "it depends".
"All the people are rising up across the country to retaliate against the U.S. thousands of times", the daily said.
"Well, it depends on the nature of the threat, right?" he said on ABC's "This Week". "Of course any response that we have we do in close cooperation with our allies in the region".
Last week Trump vowed to rain down "fire and fury" on the Hermit Kingdom if Kim continues to threaten to strike the U.S. or its allies with nuclear weapons after the United Nations Security Council imposed strict economic sanctions against the country.
"This is why what Kim Jong-un is doing is very, very risky", McMaster said, referring to the North Korean dictator. North Korea has previously mobilised large crowds to show its resolve when tensions escalate.
"I am quite confident that (North Korean leader Kim Jong Un) will continue to try to develop his missile program, so it wouldn't surprise me if there was another missile test", U.S. Central Intelligence Agency Director Mike Pompeo said on "Fox News Sunday".
Jeremy Corbyn said nuclear war would "kill millions".
But Peter Galbraith, the former U.S. Ambassador to Croatia in the 1990s during the war in the Balkans, told the Herald the back channel between the U.S. and North Korea doesn't seem to be on par with the secret line of communication between Attorney General Robert F. Kennedy and Soviet Ambassador Anatoly Dobrynin during the Cuban Missile Crisis. "But make no mistake about it, the continuation, the increased chance that there will be a nuclear missile in Denver is a very serious threat and the investigation is going to treat it as such".
Now it was on countries like China and Russian Federation along with USA allies like South Korea and Japan to work in tandem to get nuclear weapons out of the region.