If it stands, the ruling could significantly shake up the country’s politics by potentially unseating Lee Jae-myung as a lawmaker and denying him a shot at running for president.

A South Korean court convicted on Friday main opposition party leader Lee Jae-myung on charges of violating the election law, handing him a one-year prison sentence suspended for two years, the Yonhap news agency reported.

A South Korean court on Friday convicted the country’s opposition leader of violating election laws, casting a shadow over the political prospects of a man who has been considered a top contender to be the nation’s next president.