"Park's ability to lead state affairs is now destroyed… Park's prolonged rule will bring extreme confusion, leaving the country in a deadlock. The people will become victims. There will be disaster if Park does not step down and continues to cling to her remaining term in office," the lawmakers said in a statement, as quoted by the Yonhap news agency.
South Korean prosecutors placed Choi in emergency detention on Monday and requested an arrest warrant on Wednesday.
The scandal and the drastically falling level of support for the president have already caused a reshuffle of the government. On Wednesday, Kim Byong-joon, adviser of former South Korean President Roh Moo-Hyun, was appointed as the new prime minister. Park also decided to appoint head of the Financial Services Commission Yim Jong-yong as the new South Korean finance minister.