A senior official at South Korea's National Security Office has been holding talks on the upcoming Moon-Trump summit with his U.S. counterpart Charles Kupperman.<br />After wrapping up the meeting at the White House on Monday,... Kim Hyun-chong, would not be drawn on what was discussed.<br />But it's likely they worked on the agenda for the April 11th summit.<br />Kim may have also have sought ways to mediate between North Korea and the U.S. on denuclearization.<br />The North is demanding a step-by-step approach;... the U.S... a full-package denuclearization deal.<br />Kim is expected to further discuss North Korea with members of Congress before leaving on Wednesday. <br /><br />
