A top official from the Democratic People's Republic of Korea has arrived at the White House to deliver a letter from the DPRK's top leader Kim Jong-un to President Donald Trump.

Kim Yong-chol, vice-chairman of the DPRK's ruling Workers' Party of Korea Central Committee, visited the Oval Office Friday afternoon, after wrapping up a two-day meeting in New Year with US Secretary of State Mike Pompeo.

The contents of the letter were not immediately known. Earlier on Thursday in Washington, Trump had said he was "looking forward" to reading the letter.