James Mattis, the US defence secretary, said the deployment was not tied to a specific event but a matter of prudence.
“She is just on her way up there because that is where we thought it was most prudent to have her at this time,” he said at a Pentagon news conference.
Sean Spicer, the White House spokesman, said the US president had put North Korea “clearly on notice” that he would not tolerate certain actions but dismissed Pyongyang’s nuclear attack threat.
“I think there is no evidence that North Korea has that capability at this time,” he said. “Threatening something that you don’t have the capability of isn’t really a threat.”
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