Washington: North Korea is not likely to give up all of its nuclear weapons even if President Donald Trump's efforts to negotiate a deal with Pyongyang bear fruit, US Director of National Intelligence Dan Coats said Tuesday.

"We continue to assess that North Korea is unlikely to give up all of its nuclear weapons and production capabilities, even as it seeks to negotiate partial denuclearisation steps to obtain key US and international concessions," Coats said in a report to Congress on threats to the United States.