23 February 2019, at the time the impending election was yet to be announced, the party was the first to begin their election campaign despite a last-minute venue dropout, and announced that they would contest the same constituencies as they did in the 2015 election, and a goal to prevent the ruling PAP from retaining a government with a supermajority (two-thirds of the total number of parliamentary seats) that the party attained since post-independence. Party's vice-chairman John Tan announced that SDP would also unveil policy papers on housing and the cost of living the following month, followed by healthcare and population issues in May. Former DPP secretary-leader Benjamin Pwee, on the same time, was revealed that he and a few others have submitted their applications to join the SDP, after Pwee left the party on 19 February. On 21 June, the party's leader confirmed Chee would settle a rematch in the Bukit Batok SMC against Murali in the election. Three days later on the 24th, the party confirmed their intentions to contest the same wards that they challenged in the last election, namely Bukit Panjang, Holland–Bukit Timah, Marsiling–Yew Tee and Yuhua. Their nominations were confirmed on 30 June, resulting in 11 candidates competing in the election, among which three candidates made their election debut, and Tan Jee Say returning to the party after earlier dissolving Singaporean First ahead of the nominations. SDP chairman and Bukit Panjang candidate Paul Tambyah on 3 July had said the Ministry of Manpower (MOM) had told "employers they were not allowed to bring their workers for testing", an allegation that Minister for National Development Lawrence Wong later denied on 5 July. When the results was announced on 10 July, they were defeated in every seats contested, although Bukit Panjang came that close to winning the election with chairman Tambyah garnering 46.26% of the votes, while Chee came second with 45.20% of the votes while contesting Bukit Batok. Their vote share based on the constituencies contested was 37.04%, falling short from the national average of 38.76%. Organisation and structure The SDP is governed by a twelve-member Central Executive Committee (CEC), who are elected by the party's cadre members at the Ordinary Party Conference held biennially. Leadership List of secretaries-general List of chairmen Former elected Members of Parliament Electoral history Parliamentary by-election results Affiliations The affiliates with which the SDP works in co-operation are: Alliance for Reform