Kim Yong-chol is meeting Secretary of State Mike Pompeo and could hold talks with President Donald Trump at the White House later, US media say.

He reportedly has another letter from leader Kim Jong-un to Mr Trump.

Little progress has been made on North Korean de-nuclearisation since their historic summit in Singapore last June.

Speculation is mounting that a second meeting between Mr Kim and Mr Trump could be held in Vietnam.

The North Korean leader is scheduled to travel to the communist-run country for an "official state visit" sometime in February, Reuters news agency reports citing unnamed sources.

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