The Partido Popular (PP) has warned that it could seek to review the Gibraltar post-Brexit treaty if it wins the general election on November 29.

PP MEP Antonio Lopez-Isturiz White issued the warning during a debate in Strasbourg on relations between the EU and the UK.

He accused both Europe and Spain of conceding too much to the UK in the deal.

‘You failed to control it and have given everything away in the negotiations,’ he said.

‘Within a month, that is going to change… there will be a new government in Spain that will defend the country’s interests, which are Europe’s interests.’

The intervention marks a hardening of the PP’s opposition to the agreement, which began applying provisionally on July 15.

According to Europa Sur, three forthcoming dates could shape its future, comprising an EU–UK summit on November 20, Spain’s election nine days later and the European Parliament’s consent vote scheduled for December 14.

Lopez-Isturiz criticised European Commissioner Maroš Šefčovič for failing to mention Gibraltar during his contribution to the debate.

He accused both Šefčovič and Spanish Foreign Minister Jose Manuel Albares of securing inadequate terms and argued that the new arrangements posed risks to security and border controls.

Invoking the migration crisis in Ceuta, he warned against allowing Gibraltar to become ‘a new Ceuta’.

The intervention follows an earlier attempt by six Spanish PP MEPs to secure the European Parliament’s rejection of the treaty.

An amendment registered in September proposed replacing the resolution’s wording granting consent with an explicit refusal.

At this stage, MEPs can approve or reject the agreement but cannot rewrite its provisions.

However, the Spanish PP delegation’s opposition differs from the supportive position previously expressed by its wider European political family, the European People’s Party.

EPP MEP David McAllister described the treaty in September as a ‘comprehensive and pragmatic framework’ for cross-border cooperation, supporting stability and economic integration.

Vox, who polls suggest will enter the government this month, has also attacked the agreement.

Its MEP Margarita de la Pisa warned against what she called a ‘soft border’, arguing that it could undermine efforts to combat organised crime, drug trafficking and irregular migration. She described the treaty as a ‘historic mistake’.

The agreement regulates movement of people and goods, police and customs cooperation, and arrangements at the Gibraltar–Spain border.

Its provisional application means the new framework is already operating while the formal approval process continues.