South Korean President Yoon Suk Yeol defended his martial law decree as an act of governance and denied rebellion charges, vowing Thursday to “fight to the end” in response to attempts to impeach him and intensifying investigations into last week’s dramatic move.

President Yoon Suk Yeol vowed to “fight to the end,” despite the opposition’s push to impeach him and his own party’s demand that he resign.

South Korea’s ruling party has thrown its support behind attempts to impeach embattled President Yoon Suk Yeol over his ill-fated decision to declare martial law that sparked a political crisis and widespread public anger in the country.