Congressman Mac Thornberry, who chairs the powerful House Armed Services Committee that provides civilian oversight to the Pentagon, said the administration of President Donald Trump is closely studying its options.
"The administration is very seriously looking at what would be involved with military options when it comes to North Korea," Thornberry told a group of reporters.
Training efforts "are very serious," he added.
"The military has preparations under way, and hopefully they will not be needed."
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Tensions on the Korean peninsula and between Pyongyang and Washington have been sky-high for months, after North Korean leader Kim Jong-Un repeatedly test-fired missiles potentially capable of carrying a nuclear warhead and hitting the United States.
He also authorized the detonation of North Korea's most powerful nuclear device to date.
Though the US military routinely trains on the Korean peninsula with South Korean counterparts, The New York Times reported Sunday that a series of drills in the United States suggest a new focus on readying the military for conflict with North Korea.
Last week, global tensions cooled somewhat with the resumption of talks between North and South Korea.
But the rhetoric picked back up again Tuesday, when North Korea denounced President Donald Trump's tweeted message that he has a bigger nuclear button than Kim as the "spasm of a lunatic" and the "bark of a rabid dog."
Further adding to jitters, residents in Hawaii were subjected to an erroneous alert Saturday warning them that a missile was inbound.
Emergency management officials later admitted "the wrong button was pushed" during a shift change.