 He represented the town of Potchefstroom in Parliament for nearly thirty years from 1988-2017, initially elected as an MP for the Conservative Party (KP).Prior to South Africa's first multi-racial election in 1994, Mulder co-founded the Freedom Front with General Constand Viljoen, a former head of the South African Defence Force.At the election in 1994, the Freedom Front won nine seats in the National Assembly.