1997 General Election After graduating from NUS in 1994, Chia met Tan Chee Kien, the president of the opposition
National Solidarity Party (NSP). He joined the party around the end of 1994 and gradually rose to the position of the party's assistant secretary-general During his term as a NCMP from 5 November 2001 to 18 April 2006, Chia posed questions in Parliament on various issues, including
National Service,
HDB flats for singles, bus and train fare subsidies, and organ transplants. Chia claimed in a 2020 interview with
Mothership that he asked the highest number of questions among all the Members of Parliament in the 10th Parliament. During the
2020 general election, Chia along with Williamson Lee, Melvyn Chiu and Osman Sulaiman contested in
Bishan–Toa Payoh GRC against the PAP team of
Ng Eng Hen,
Chong Kee Hiong,
Chee Hong Tat and
Saktiandi Supaat. The SPP team lost with 32.77% of the vote against the PAP team's 67.23%.
2025 General Election In the
2025 General Election, Chia led a four-man team consisting of himself, Melvyn Chiu, Lim Rui Xian and Muhammad Norhakim at
Bishan-Toa Payoh GRC, in a straight-fight against the incumbent PAP team led by then-Minister for Transport
Chee Hong Tat. However, the SPP team lost, securing just 24.82% of the vote, or 21,944 votes. ==Controversies==