This will mark the first time for high-ranking White House officials to travel to South Korea after Moon was sworn in as president last Wednesday.

The US officials are expected to meet with senior South Korean officials from the presidential office Cheong Wa Dae and the foreign ministry to apparently discuss the timetable and other necessary issues related to summit talks that Moon and Trump are seeking to hold.

Observers say that the summit will likely take place as early as June. Some expect their first talks could be delayed until the Group of 20 summit to be held in Germany during July 7-8 or even after.

The leaders will likely discuss cooperation on North Korea's evolving nuclear and missile threats. Also high on the agenda could be the deployment of the THAAD missile defense system in South Korea, which was decided and carried out by the administration of Moon's predecessor.

The White House delegation's trip to Seoul, meanwhile, comes amid heightened tensions after the North carried out a ballistic missile test on Sunday, Pyongyang's first provocation since Moon's inauguration.

Moon condemned North Korea for the latest missile launch, calling it a grave threat to regional security and a clear violation of the UN Security Council resolutions. (Yonhap)