South Korea’s impeached President Yoon Suk Yeol appeared in a Seoul court on Thursday for his first trial hearing on charges of insurrection in the country’s first criminal prosecution of an incumbent leader.

South Korean President Yoon Suk Yeol is in court for a hearing where his lawyers are contesting his arrest on a criminal charge alleging he was orchestrating a rebellion when he imposed martial law.

South Korea’s Constitutional Court will hold another hearing next week before deciding whether President Yoon Suk Yeol should be permanently removed from office for his ill-fated martial law declaration in December.