The party nominated Southern District Councillor Judy Chan to represent in the 2018 Legislative Council Hong Kong Island by-election running against independent democrat Au Nok-hin for the seat left vacant by the oath-taking controversy which resulted in the disqualification of six legislators. The party combined forces with the Democratic Alliance for the Betterment and Progress of Hong Kong (DAB) and the Hong Kong Federation of Trade Unions (FTU) to form a united front against the pro-democrats. As a result, Chan was narrowly defeated in the election by only three per cent of margin by receiving more than 127,000 votes.