Instead of mass resignations made by the members of Barisan Sosialis in the parliament who opted to protest and "struggle for democracy" on the streets as the 1968 general election had effectively removed all oppositions from the parliament, this time it was five members from People's Action Party were invited to resign and give way to new blood as a part of renewing PAP's ranks. This translates into five vacant constituencies, namely in Delta, Havelock, Kampong Kapor, Ulu Pandan and Whampoa and triggers the polling day on 18 April 1970 and the nomination day on 8 April 1970.