Protesters marched through the streets of Seoul on Saturday demanding the repeal of ex-President Park Geun-Hye’s impeachment.
Prosecutors have ordered the ousted president to appear before them on Tuesday for questioning over the corruption scandal that triggered her dramatic downfall.
A criminal suspect in the scandal, Park had repeatedly refused to make herself available for questioning by the prosecutors before the country’s highest court confirmed a parliamentary impeachment motion against her.
South Korean prosecutors will question the chairman of the SK Group in connection with the scandal, the company and the Yonhap news agency said.
Saturday’s protest against the impeachment saw 2,000 of her supporters walking slowly, waving banners and national flags, including a huge one carried by some 100 people.
Friday’s final ruling stripped her of power and executive privileges, including protection from criminal indictment, and she left the presidential palace at the weekend. Park has voiced defiance over the court ruling, saying “the truth will eventually be revealed”.
Meanwhile, the liberal South Korean politician most likely to become the country’s next president would, if elected, review how the government would deploy an advanced US missile defence system and would consult China, two of his top advisers said on Friday.
If Moon Jae-in, front-runner for the May 9 presidential election, reverses policy on the deployment of the Terminal High Altitude Area Defence (Thaad) system, it will place him at odds with the United States, South Korea’s biggest ally.
The conservative government of Park agreed to deploy the Thaad to guard against attack by North Korea, but the decision sparked outrage in China, which responded with restrictions on some companies doing business with and in South Korea.
China says the system’s radar can be used to spy into its territory. China is South Korea’s largest trading partner and the dispute over Thaad has left shopping districts in Seoul devoid of their usual crowds of Chinese tourists.
Moon, a liberal facing little in the way of a significant conservative challenger, said in a debate this week China should stop the economic retaliation and South Korea had to make diplomatic efforts to assuage Chinese anger.