Pedro Sanchez

At a press conference at the party's headquarters on Ferraz Street in Madrid, following the resignation of the party's Secretary of Organization, Santos Cerdán, Sánchez said that his response to corruption will be the magnitude of his disappointment.

Several groups that supported Sanchez's investiture have also asked the PSOE for explanations.

He has expressed concern about the information published about Cerdán and has stressed that citizens are watching the government's explanations.

Coalición Canaria, for its part, has called for a State of the Nation Debate to be held to address the issue and has also stated that the search for culprits is the job of the judges.

Sumar , in coalition government with the PSOE, has also called for "transparency" from the PSOE in the face of "serious accusations" against Cerdán.

Opposition groups increase pressure on Sanchez

The PP spokesman in Congress, Miguel Tellado, has asked the coalition government to give explanations. He has gone further and wants resignations and early elections. "Today Pedro Sánchez has to appear, taking advantage of the fact that today he has to come to congress," he said in the halls of the congress.

Vox, for its part, has expressed its intention to initiate legal proceedings following the UCO report.

According to various media reports, on a recording obtained by the UCO unit of the Civil Guard, PSOE's Secretary of Organization, Santos Cerdán, is heard talking about the money owed to them by various companies, with former Transport Minister José Luis Ábalos and his former adviser, Koldo García.

In total, the debt would be around EUR 400 000, according to the researchers, for charging commissions to construction companies in exchange for awarding public works.