South Korean President Yoon Suk Yeol appeared in a Seoul court for his impeachment trial Tuesday, defending his short-lived martial law bid and denying charges that he ordered the military to drag lawmakers away.

South Korean investigators asked prosecutors to indict the country’s detained President Yoon Suk Yeol over his short-lived imposition of martial law last month, as it accused him of rebellion, abuse of power and obstruction of parliament.

South Korean President Yoon Suk Yeol has so far refused to cooperate with investigators after he was arrested for questioning on Wednesday, the country’s anti-corruption agency said.