HNS held the same alliance in the parliamentary elections of 2015 and 2016 as a part of SDP-led "People's coalition", switching to opposition. After the party chairman Ivan Vrdoljak and the party's general board decided to enter the government with centre-right Croatian Democratic Union (HDZ) and support Andrej Plenkovic's cabinet in the parliament (overriding the opposition of party's Presidency), in June 2017 four MPs and the only MEP (Jozo Radoš) left the party to create left of the centre Civic Liberal Alliance. This splinter also resulted in numerous party members and branch leaders leaving the party, either to join Civic Liberal Alliance or other parties. In October 2018, MP Marija Puh left the party fraction in the parliament to join Milan Bandic's party, reducing the fraction further down to just 4 MPs.