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John Bolton said North Korea's warning that a "nuclear war may break out at any moment" is just propaganda, but he cautioned that "time is running out" to curb the rogue regime's nuclear weapons program.

"They are definitely getting close to the capacity to hit targets all over the continental United States," Bolton said on "America's Newsroom." "Time is running out. It has been running out. And it's landed in the Trump administration's lap."

The former U.S. ambassador to the United Nations said North Korea has been working toward becoming a nuclear power for 25 years, and now that they are "close to the finish line," there's no chance that they will be talked out of it.

He said the only diplomatic solutions are for China to put enough pressure on Kim Jong Un's regime that it collapses or to reunite North and South Korea.

"Otherwise, the options look a lot grimmer," Bolton said, pointing out that some - like former National Security Adviser Susan Rice - think we should let North Korea get nuclear weapons and just live with it.

He said that would be disastrous for the U.S. and the world.

"As the president said in his speech the United Nations two weeks ago, as far as North Korea goes, denuclearization is the only way forward, meaning they are not left with nuclear weapons. Period."

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