This is being reported on NBC.

The U.S. is prepared to launch a preemptive strike with conventional weapons against North Korea should officials become convinced that North Korea is about to follow through with a nuclear weapons test, multiple senior U.S. intelligence officials told NBC News.

...

The intelligence officials told NBC News that the U.S. has positioned two destroyers capable of shooting Tomahawk cruise missiles in the region, one just 300 miles from the North Korean nuclear test site.

American heavy bombers are also positioned in Guam to attack North Korea should it be necessary, and earlier this week, the Pentagon announced that the USS Carl Vinson aircraft carrier strike group was being diverted to the area.

On Wednesday, North Korea said it would "hit the U.S. first" with a nuclear weapon should there be any signs of U.S. strikes.

On Thursday, North Korea warned of a "merciless retaliatory strike" should the U.S. take any action.

I’ve been hearing since yesterday that North Korea is planning another nuke test on Saturday.

In any kind of full scale conflict, Seoul South Korea would be pretty much destroyed and there would be hundreds of thousands of casualties.

This is the nightmare scenario of allowing a psychopathic moron to be elected to control our military.  For all you deity believers, now is the time to start asking for favors.

UPDATE: There’s some push back from the Pentagon now.