contested. 2015 General Elections Ahead of the 2015 elections (due to be held 11 September), Chiam announced that he would not stand as a candidate for the elections, for the first time since his debut in 1976. Another opposition party, the Democratic Progressive Party, who led by Benjamin Pwee and Hamin Aliyas, joined SPP to strengthen its team contesting Bishan–Toa Payoh GRC. New candidate Ravi Philemon replaced Chairman Sin as candidate for Hong Kah North, while Lina Chiam contested again in Potong Pasir. Former NSP member Jeannette Chong-Aruldoss joined the party prior, and contested Mountbatten SMC just as Chong did in the 2011 elections. However, the absence of Chiam in the election saw their party suffered another major setback, not only did the party fail to win a parliamentary seat, their scores were overseen by large swings towards the PAP, one of which was Potong Pasir, where Lina Chiam managed to secure only 33.59% of the valid votes, down from 49.64%. Comparing to the Workers' Party's performances (of East Coast GRC, Fengshan SMC and Punggol East SMC), this was not enough for Chiam to secure her NCMP seat for a second term, thus ending their party presence in Parliament since the party foundation. In terms of the party's overall vote, they garnered only 27.08% of the votes cast, a swing of -14.34% from the previous election. On 1 March 2017, the party reported that former party's chairman Sin died from prostate cancer two days ago. In January 2018, it was reported that Jose Raymond, a former Press Secretary to Vivian Balakrishnan (who also served as Chief Executive of the Singapore Environment Council and current Minister of Foreign Affairs), had joined the SPP. Also in the same year, WP's Low Thia Khiang surpassed Chiam as the longest-serving opposition MP, having served in Parliament since 1991. Leadership Transition and 2020 elections On 4 September 2019, Chiam announced that he would step down from the secretary-general post due to declining health and Lina Chiam would step down from the chairman post, while the party's Facebook page posted that they would electing a new leader by 16 October on a biennial Ordinary Party Conference, among which Jeannette Chong-Aruldoss would be stepping down from the party's Central Executive Committee (CEC). Chiam stepped down on 16 October 2019, with four new faces elected into the Central Executive Committee. On 5 November 2019, Steve Chia was elected