South Korea's deputy chief of the National Security Office Kim Hyun-chong talked with his U.S. counterpart Charles Kupperman on the upcoming Moon-Trump summit.
After wrapping up the meeting at the White House on Monday,... Kim didn't reveal exactly what was discussed.
But it's likely they worked on the agenda for the April 11th summit.
He might have also discussed ways that South Korea could mediate between North Korea and the U.S. on denuclearization.
The North is demanding a step-by-step approach... while the U.S. is demanding a full-package denuclearization deal.
Kim is expected to further discuss North Korea with members of Congress before leaving on Wednesday.