Badruddin was also, until his defeat in the March 2008 General Elections, the Member of Parliament for the constituency of Jerai, Kedah in the lower house of Parliament, the Dewan Rakyat.
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Badruddin was not a very well known politician in the early 1990s, and was a backbencher in Parliament as Member of Parliament (MP) for the constituency of Yan in Kedah until his defeat in the 1999 general election to Nasharudin bin Mat Isa from PAS, losing by 182 votes.
Firdaus was elected to the Jerai seat in the 2008 election, defeating incumbent Badruddin Amiruldin of the ruling Barisan Nasional coalition.