Andrew Harnik
FILE - In a Friday, Oct. 13, 2017 file photo, Secretary of State Rex Tillerson answers a reporters question while greeting Organization of American States Secretary-General Luis Almagro at the State Department, in Washington. Tillerson said Sunday, Oct. 15, in a television interview that President Donald Trump wants a diplomatic solution to the North Korean crisis and is not hankering for war with the nuclear-armed nation, despite past tweets that America’s chief envoy was ``wasting his time’’ trying to negotiate with the North’s leader.(AP Photo/Andrew Harnik, File)

WASHINGTON (AP) — Secretary of State Rex Tillerson says diplomatic efforts aimed at resolving the North Korean crisis "will continue until the first bomb drops."

But it was only recently that President Donald Trump tweeted that Tillerson was "wasting his time" trying to negotiate with the leader of the nuclear-armed nation.

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Tillerson says in a television interview that Trump "has made clear to me that he wants this solved diplomatically. He is not seeking to go to war."

Mixed messaging from Washington has raised concerns about the potential for miscalculation amid the increasingly bellicose exchange of words by Trump and Kim.

North Korea has launched missiles that potentially can strike the U.S. mainland and recently conducted its largest ever underground nuclear explosion. It's threatened to explode another nuclear bomb above the Pacific.