A former military commander who has accused President Yoon Suk Yeol of ordering the removal of lawmakers from the National Assembly building during December's brief imposition of martial law is set to testify at Yoon's impeachment trial Thursday.

Yonhap news agency says South Korean prosecutors have indicted the impeached President Yoon Suk Yeol over his imposition of martial law.

The Constitutional Court is separately deliberating whether to formally dismiss Yoon Suk Yeol as president or reinstate him. Yoon was impeached and suspended by the assembly last month.