Singapore ruling party faces crisis as parliament speaker, lawmaker resign over misconduct

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.