Spain’s ruling Socialist Party has increased its share of voter support following Prime Minister Pedro Sanchez’s outspoken opposition to the U.S.-Israeli war on Iran, according to two new polls released on Monday.

The surveys suggest shifting political dynamics in Spain, with the far-right Vox party losing ground while mainstream parties consolidate support.

Opposition to war shapes political debate

Sanchez has taken one of the strongest positions among Western leaders against what he has described as an illegal and reckless war.

His government has closed Spanish airspace to U.S. aircraft linked to strikes on Iran and banned their use of jointly operated military bases in southern Spain.

The stance has drawn criticism from the opposition but appears to have influenced public opinion.

Polls show gains for Socialists and decline for Vox

A survey by state pollster CIS found that a large majority of respondents oppose the war, reflecting broader public sentiment.

In a Sigma Dos poll for El Mundo, support for the Socialist Party rose to 27.7%, up from 26.4% the previous month. A separate 40dB poll for El Pais placed them at 28.6%, also showing an increase.

At the same time, Vox declined to 17.1% in one poll and 18.7% in the other, continuing a downward trend.

Conservative PP remains in lead

The conservative People’s Party (PP) remained the leading political force in both surveys, with support of around 31–32%.

While the party has criticised Sanchez for straining transatlantic relations, it has also echoed anti-war sentiment without directly condemning U.S. or Israeli actions.

Voter shifts toward mainstream parties

Both polls indicate a broader shift of voters away from political extremes toward mainstream parties.

The Socialists appear to be attracting former voters from their left-wing coalition partner Sumar, while the PP is consolidating support and limiting gains for Vox.

Coalition politics remain decisive

Despite these shifts, Spain’s fragmented political landscape means coalition-building will remain essential for forming a government.

Both surveys suggest that a right-leaning majority could still emerge if elections were held now.

The next general election is scheduled for August 2027.