"We expect that the delegation's visit could pave the way for making progress in discussing issues of declaring an end to the 1950-53 Korean War and bringing peace to the peninsula," Lee Hae-chan, the chairman of the DP, said at a meeting with senior party officials.

President Moon and North Korean leader Kim Jong-un are widely expected to hold their summit this month after their first meeting in April and another in May.

"South Korea is a party to Korean Peninsula issues and also a mediator (in resolving the North's nuclear issue)," Lee said, adding that the DP will support Moon's peace efforts.

Hong Young-pyo, the floor leader of the DP, called on parliamentary ratification of the April inter-Korean summit agreement.

"I once again hope that the ruling and opposition parties could visit North Korea together when the third summit will be held," he said.

"As there are mounting calls from the pubic to support the April summit deal, the National Assembly should reach a compromise (over the ratification) as soon as possible," Hong stressed. (Yonhap)