He says days of grave threats to the communist country's leader would be welcomed as "a great statement" if "somebody else" uttered them.
On Thursday North Korea threatened to use its young people to "blow the U.S. from this planet".
"We have been working very closely with China and with other countries".
China has repeatedly urged a resumption of long-dormant six-party talks to peacefully resolve the crisis, but its position has been overshadowed by the emerging brinkmanship between Trump and Kim.
"Make sure you understand that this is not the final decision", Robert Carlin, the former chief of the Northeast Asia Division at the State Department's Bureau of Intelligence and Research, told reporters on a call organized by 38 North, a website that brings together experts on North Korea.
North Korea released this propaganda photo of a mass rally in Pyongyang this week in support of Kim Jong-un.
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Just this past weekend, the administration was congratulating itself for orchestrating a unanimous U.N. Security Council vote to sharply increase sanctions against Pyongyang, describing steady diplomatic and economic pressure as the keystone of its strategy.
"Hopefully it will all work out".
"Mr. President, as the governor of Guam representing the people of Guam, and as an American citizen, I have never felt more safe or confident with you at the helm", Gov. Calvo said. "And this man will not get away with what he's doing, believe me".
Moscow said the exchange of threats between Washington and Pyongyang "worry us very much".
Damian Green, First Secretary of State, said today it is "obviously" in Britain's interests for the two nations not to go to war.
Meanwhile Australian Prime Minister Malcolm Turnbull said Australia would come to the aid of the United States if North Korea attacks America.
"I think escalating the rhetoric is the wrong answer".
But it also said that if the US and South Korea attacked North Korea to force regime change, then China must intervene to prevent it.