Clapper, in a statement on Wednesday, said he had spoken with Trump that evening and told the president-elect that he did not believe the media leaks of the report came from the intelligence community.

The director of national intelligence says he's formally submitted his resignation.

North Korea has expanded a uranium enrichment facility and restarted a plutonium reactor that could start recovering spent fuel in weeks or months, the U.S. intelligence chief said Tuesday in delivering the annual assessment by intelligence agencies of the top dangers facing the country.