Founding The PSP was founded in 2019 by
Tan Cheng Bock and 11 other members. They, together with
Lee Hsien Yang, the estranged brother of then-
Prime Minister Lee Hsien Loong, expressed that the existing PAP leadership had "lost its way" and deviated from the party's founding principles. The party was officially registered on 28 March 2019 with 12 members after being approved by the Registry of Societies. Tan said that the registration was the result of an erosion of governmental transparency, independence and accountability. Job creation was also cited as a main focus.
2020 general election On 29 September 2019, Tan led about 300 party members and volunteers during the PSP's first official island-wide walkabout. The walkabout, named "29 on 29", was conducted in 29
constituencies. In October 2019, the party called for volunteer polling and counting agents. On 4 November, the PSP called for an opposition alliance meeting, privately attended by representatives from seven opposition political parties. According to Tan, the meeting was to discuss future plans and to introduce members of different parties to one another. On 9 November, the party began its second island-wide walkabout, involving about 220 members and volunteers. On 12 January 2020, the party held its second series of door-to-door house visits in
West Coast GRC, led by Tan and joined by more than 200 members and volunteers. The event involved 22 teams and covered 50 residential blocks. A walkabout of about 40 members had been conducted in 2019 within the same
constituency. On 17 January, a reshuffling of leadership was announced at the PSP's new year party. Two members of the central executive committee (CEC) exited, replaced by five new members. On 27 January, the PSP officially opened its new headquarters at
Bukit Timah Shopping Centre. On 10 July 2020, despite fielding the largest opposition slate with 24 candidates, the PSP did not win any constituencies; however, it came closest to winning
West Coast GRC, whose PSP team was led by Tan himself and lost to the PAP team, led by
S. Iswaran, with 48.31% of the vote. For having received the best result among defeated opposition candidates, the team was entitled to select two NCMPs. The party garnered 40.86% of the vote in contested constituencies, higher than the nationwide opposition vote share of 38.76%. It received 10.18% of the nationwide vote. On 14 July, the PSP announced that Poa and Leong had accepted the NCMP seats.
2020–2025: First Representation in Parliament of Singapore with NCMPs After the elections, Poa and Leong stepped down as office bearers to focus on their NCMP duties. Both remained as CEC members and are involved in the party's activities.
Francis Yuen took over as assistant general-secretary, while the vice-chairman post remained vacant. Since then, PSP has formed its women's wing and youth wing to create more targeted policies helping these groups, headed by Tanjong Pagar GRC candidates Wendy Low and Terence Soon respectively. In addition, a Parliamentary Secretariat was formed to help the NCMPs with policy research for their duties, which is headed by both Leong and Poa. The women's wing was officially launched on 30 January 2021. The PSP's CEC underwent a leadership renewal in March 2021; 11 CEC members stepped down and six new CEC members were elected. On 1 April, PSP announced that Yuen has taken over as the secretary-general of the party, with Tan being the chairperson. Wang Swee Chuang hence became the vice-chairperson. Later on 26 April, youth wing head Soon resigned citing career opportunities and family considerations, with newly elected member Jess Chua taking over three days later. On 11 August 2021, party member Brad Bowyer resigned from the party after he made a post comparing differentiated measures for those vaccinated with the
Holocaust, sparking controversy and condemnation including from the Israeli Embassy in Singapore. Bowyer has since stood by his views. On 25 October, treasurer and party member Kayla Low resigned from the Party citing frequent travelling requirements as part of her new career, although she would continue to volunteer with the Party. Party member Peggie Chua took over as the new treasurer. The following month, former party member Kala Manickam sued the party over claims of wrongful termination and seeks to have $10,000 reimbursed, to which the party leadership said there was no basis to the lawsuit, listing various events that led to her termination. On 14 February 2022, Kumaran Pillai told party leaders he would step down from the positions of communications chief and party spokesman, taking a "leave of absence" for an unspecified period of time due to business ventures and health considerations, including a frozen shoulder sustained during a walkabout in the
2020 general election. Pillai will still be in the central executive committee, with Jonathan Tee taking over as the new communications chief, announced three days later. On 4 April 2023, Leong succeeded Yuen as the new secretary-general after Yuen stepped down, with the party stating in a press release on 26 March that Yuen had "recently been appointed as executive chairman of an overseas publicly listed company, so his new position will make it difficult for him to lead the party". The PSP's Vice-Chairman Wang and Head of Youth Wing Chua also stepped down from the CEC, The party came under spotlight during the last days of campaigning for the
2023 Singaporean presidential election after the party's founder Tan (along with
Singapore Democratic Party and former presidential candidate
Tan Jee Say) were reported to have given endorsements to a two-time candidate
Tan Kin Lian in his presidential bid. The party responded that it was their discretion to support their candidates, and mentioned they will neither endorse or support any candidate who are non-partisan (a constitution rule where Presidency candidates are not allowed to be affiliated on any party at the time of election), and brought concerns citing that it may negatively impact the party. Prior to the election, Lee Hsien Yang also had expressed his intention to run for candidacy, but ultimately did not collect his application forms. On 23 February 2024, Leong stepped down as secretary-general of PSP after the Singapore government issued a
POFMA order which refuted the falsehoods made by Leong on his Facebook post. He remained on the party's governing body and as an NCMP.
2025–present: Electoral setbacks On 6 April 2025, PSP launched their manifesto. The party also announced its intention to contest in
West Coast–Jurong West and
Chua Chu Kang GRCs. They fielded fewer candidates in the
2025 general election compared to 2020. the PAP's swings across the constituencies including West Coast–Jurong West GRC resulted in PSP not being awarded any NCMPs, ending their parliamentary presence. In their post-election interview, Leong described it as "shocking" but vowed to work hard "seriously and humbly" in the next election. ==Organisation==