Hundreds of thousands of South Koreans are rallying in Seoul calling for the ouster of President Park Geun-hye, who lawmakers may attempt to impeach by as early as next week.

Police say 260,000 people turned out for Saturday's protest against Park, the fifth straight weekend of demonstrations. Organizers put the turnout at 1 million.

Prosecutors accuse Park of assisting criminal activities of a secretive confidante who allegedly manipulated power from the shadows and extorted companies to build an illicit fortune.

The country's largest opposition party says it will seek to propose an impeachment motion for vote as early as Friday and no later than Dec. 9. Some members of Park's conservative party have vowed to support the impeachment attempt.