Navarrese People's Union

As part of an agreement held over the 1991–2008 period, the PP did not run in any elections in the Navarra Congress Electoral District and People's Party of Navarre (founded in 1989) was dissolved, while UPN were on the same national ticket as the PP at the Spanish national elections. The national Deputies and Senators elected as part of UPN's ticket were part of the PP Parliamentary Group. Also, UPN members were eligible –and indeed chosen– for national leadership positions in the PP.

The pact was terminated in October 2008 as a result of UPN refusal to vote alongside the PP in the Spanish Congress of Deputies to reject the government budget presented by José Luis Rodríguez Zapatero's cabinet. One of the two MPs elected under the UPN-PP ticket refused to follow UPN's instructions and a number of UPN elected representatives defected this party to join the PP.[10][11][12] The new situation led to the PP setting up its own office in Navarre.[13]

The two parties ran separate lists in the 2011 regional elections in Navarre with the UPN receiving 34.5% against the 7.3% that the PP received. On 8 September 2011, the two parties reached an agreement to renew their alliance for the 2011 Spanish general election.[14] Under the agreement, the UPN would take the first and third places on the list for Congress while the PP would have the second. For the Senate, the UPN would have the top two places on the list, with the PP taking the third place. A major factor in the new agreement was the two parties desire to prevent Bildu from winning enough seats to form a parliamentary group.[14]