South Korea will re-evaluate the opening of a joint liaison office with North Korea, a presidential official said Monday, indicating a possible delay amid an apparent stumbling block in US-North Korea talks on ending North Korea's nuclear ambitions.

The remarks came three days after US President Donald Trump called off a scheduled trip by his State Secretary Mike Pompeo to the communist North.

"The opening of the liaison office had been planned under smooth progress (in denuclearization efforts), such as Pompeo's North Korea trip and the South-North Korea summit, but we believe there is a need to once again review the issue since a new development has emerged," Cheong Wa Dae spokesman Kim Eui-kyeom told a daily press briefing.

The liaison office was earlier expected to be opened as early as this month. The proposed office comes under an agreement reached by South Korean President Moon Jae-in and North Korean leader Kim Jong-un when they first met in the border village of Panmunjom on April 27.

Moon and Kim are set to meet again next month in Pyongyang, which will mark their third bilateral summit since Moon took office in May 2017. The two held their second summit in Panmunjom on May 26.