The U.S. is closely watching North Korea for signs of a possible missile launch or nuclear test in the coming days that officials are referring to as a “Christmas surprise.”

A substantial launch or test could signal a decision by Pyongyang to end its self-imposed moratorium on nuclear and long-range missile tests.

That would deal a significant blow to one of the Trump administration's major foreign policy initiatives: the drive to get North Korea back to negotiations on ending its nuclear weapons program.

President Donald Trump tweeted Friday that he discussed North Korea with China's leader.

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