During his time abroad, Chen regularly returned home to Singapore to visit his parents, his sister, and her family. Chen stated that he joined the WP because he believed that "the best way to ensure good governance for Singapore is through the growth of a competitive opposition that offers a credible alternative to the party in government". During an interview, Chen frankly explained why he decided to join the WP: On 27 April 2011, Chen submitted his candidacy for the five-member
Aljunied Group Representation Constituency (Aljunied GRC) with the WP's Secretary-General
Low Thia Khiang, Chairman
Sylvia Lim,
Pritam Singh, a postgraduate law student, and
Muhamad Faisal Abdul Manap, a freelance counsellor. The incumbent team included two cabinet ministers and one Senior Minister of State, and was helmed by the prominent
Minister for Foreign Affairs,
George Yeo. During the intense nine-day campaign period that followed, Chen was singled out by leaders of the ruling
People's Action Party (PAP) for criticism. The PAP's Organising Secretary and Minister for Education,
Ng Eng Hen, questioned Chen's motives for entering politics in a letter to
The Straits Times. Ng also questioned whether Chen would be able to relate to the aspirations of Singaporeans after having spent most of his career in the United States and China. The PAP's co-founder and former Prime Minister
Lee Kuan Yew also suggested that Chen could return to China after losing in the election. Throughout the campaign, Chen kept a low profile when the WP was faced with tough questions, instead allowing frontman Low Thia Khiang to take the heat. He displayed his affinity with regular Singaporean culture and Singaporeans by addressing crowds at rallies with smatterings of Malay and Hokkien to dispel the notion that he was a "foreigner", as he had spent many years abroad. He also highlighted at a WP rally that he came to Singapore at a young age with his parents and sister, that he served National Service, and that he owns an apartment in Bishan and frequently commutes by train. On 7 May 2011, Chen and his WP team won the Aljunied GRC with 54.71% of the total votes cast, with Yeo's PAP team obtaining 45.29% of the votes. The victory was considered historic because it was the first time that GRC seats had been captured by an opposition party, and the first time that two cabinet ministers had lost their parliamentary seats in a general election. Chen became the first foreign-born opposition MP in the history of Singapore, while his teammates Sylvia Lim and Muhamad Faisal Manap became the first female opposition MP and the first Malay opposition MP respectively. Also, together with Pritam Singh and Muhamad Faisal bin Abdul Manap, he became one of the first three opposition MPs to be elected into parliament at the first attempt. In the
Singapore General Election 2015, the WP candidates successfully defended Aljunied GRC against a PAP team with little political experience. Their vote share was reduced to 50.95%. He served as the
Member of Parliament (MP) of
Aljunied GRC for Paya Lebar from 7 May 2011 to his retirement as MP on 23 June 2020 and was succeeded by
Sylvia Lim. In May 2016, Chen challenged the incumbent Secretary-General and leader of the Workers' Party Low Thia Khiang for the position and lost. In September of the same year, it was reported by the press that Chen quit as Treasurer but still remained on the Exco as a council member. Chen however later clarified that his tenure ended. Chen has remained politically active despite retiring from
Parliament prior to the
2020 general election.
Committee of Selection On 15 October 2011, it was announced that Chen was nominated to sit on the
Committee of Selection, making him the first non-People's Action Party MP to be named to this committee. ==Political positions==