Overview

• Speaker of parliament Tan Chuan-Jin resigned over inappropriate conduct and language.
• Lawmaker Cheng Li Hui also resigned due to an inappropriate relationship with Tan Chuan-Jin.
• Resignations are highly unusual for Singapore's long-ruling People's Action Party.
• Comes amid other scandals like graft probe of cabinet minister.
• Seen as major crisis for PAP amid leadership succession, voter unhappiness over costs.