
The House cast a 252: 106 vote to reject the request by DSI chief Tharit Pengdit to lift the immunity of the nine MPs, who are red-shirt leaders.
The nine MPs, including Weng Tojirakarn, Natthawut Saikua and Jatuporn Promphan, were wanted on charges of violating national security with their speeches during a rally on April 10.
The coalition voted to keep the legal immunity - although the nine MPs told the House they wanted to forfeit their right to legal immunity.