South Korean President Yoon Suk Yeol's security chief said on Friday the impeached leader, who faces arrest over a criminal probe into his Dec. 3 martial law bid, has been unfairly treated for a sitting leader and warned bloodshed must be avoided.

South Korean opposition parties introduced a bill Thursday calling for an independent investigation into impeached President Yoon Suk Yeol’s brief martial law declaration.

The case, involving an inquiry into a marine’s death, had stoked political tensions long before President Yoon Suk Yeol’s impeachment last month.