Judge García Castellón will supervise the European investigation into the Armengol and Torres contracts with the Koldo plot. The investigation opened by the European Prosecutor's Office focuses on the alleged misappropriation of community funds with the contracts signed by the Executives of the Congress of Deputies and Minister Ángel Víctor Torres.

In recent months, this judge has become a bête noire for the Government of Pedro Sánchez and Junts after having referred the evidence of terrorism against the former Catalan president Carles Puigdemont.