Police investigating independent lawmaker Lee Choon-suak on allegations of illegal stock trading have raided the National Assembly Secretariat.

The financial crime investigation unit of the Seoul Metropolitan Police Agency said Wednesday that its investigators are conducting a search to secure evidence.

The four-term lawmaker faced backlash earlier this month after a local media outlet published a photo allegedly showing him trading stocks under his aide’s name on a mobile phone during a parliamentary plenary session.

Police have since launched an investigation targeting Lee and his aide, Cha, on suspicion of using false names to trade stocks and engaging in activities that could create conflicts of interest.