Lee Do-hoon, special representative for Korean Peninsula peace and security affairs, speaks to reporters upon arriving at Washington's Dulles International Airport on Sept. 19, 2019. (Photo: Yonhap)

The two are scheduled to meet Friday to coordinate their positions before Washington and Pyongyang sit down for talks on denuclearization in exchange for economic and political concessions. Lee said that in his talks with Biegun he plans to discuss ways to maintain dialogue momentum with the North while also making progress on substantive issues.