A South Korean joint investigation team including police has issued a summons to impeached President Yoon Suk-yeol to appear for questioning next week over the short-lived martial law he declared earlier this month.

It's the second time the joint team has made the request. It also did so on Wednesday.

The team announced on Friday that it delivered the summons via express mail and electronically. Yoon was requested to appear for questioning at the Corruption Investigation Office for High-ranking Officials, or the CIO, at 10 a.m. next Wednesday.

Yonhap News Agency reported that the team is looking at charges of insurrection and abuse of power against Yoon.
Multiple teams had been investigating the case and issued summonses separately before parties involved agreed that the CIO will lead the probe. Yoon has refused to receive all of them. The president's defense lawyers had criticized the investigation team, saying it needs to be streamlined.

Yonhap said the CIO may consider filling for a court warrant to detain Yoon if he continues to ignore the summons without valid grounds.