The South Korea-U.S. summit originally set for mid-May could be moved up to accommodate the U.S.-North Korea summit being held earlier than anticipated. 

A senior presidential official in Seoul hinted at the possibility to reporters on Monday, noting U.S. President Donald Trump’s comment at a rally on Saturday that he expects to meet North Korean leader Kim Jong-un over the next three to four weeks.

The official said that if the Trump-Kim meeting is held mid-May, it would be too close to the South Korea-U.S. summit, adding that Seoul will arrange the summit schedule when Washington sets a date for its summit with Pyongyang. 

Regarding Kim's offer to close down its nuclear test site in May and reveal the process to the outside world, the official said it's too early to say whether representatives from the International Atomic Energy Agency could be included. The official said, however, that the North has said related international experts could be invited.