Workers' Party MP Yaw Shin Leong has vacated his seat. The law states that a by-election must be held when an MP has vacated his seat, but does not stipulate the timeframe. SMU Assistant Professor of Law Jack Lee Tsen-Ta also noted that the law is worded differently regarding GRCs: A by-election is mandated only if all of the MPs in a GRC vacate their seats.
The Straits Times