In 2013 , the party started organising in the rest of Spain with a manifesto called " La conjura de Goya " ( " Confederacy of Goya " ) that took place in the Congress Palace of Madrid . In the 2015 general elections , Cs entered parliament with 13.9 % and 40 seats . As PP 's Mariano Rajoy refused the mandate to form a government , Cs promised the second-largest party PSOE support in parliament in exchange for a number of political concessions . However , this pact would have needed the support of Podemos and finally did not gain a parliamentarian majority , paving the way for a repeat election . In the 2016 snap elections , Cs lost 0.8 % of the popular vote and 8 seats due to Spain 's electoral system . After these elections , Cs could strike a deal with the conservative PP in supporting its government in exchange for a number of political concessions . After a 10-month political deadlock , PP leader Mariano Rajoy was able to become Prime Minister thanks to Cs support and an abstention of PSOE
After a 10-month political deadlock
2015–16 Spanish government formation
Citizens (Spanish political party)