The High Court of Spain has launched an investigation into Juan Manuel Serrano, the former chief of staff to Prime Minister Pedro Sanchez, amid a broader corruption probe.
This investigation marks a continuation of scrutiny on members of the Socialist Party (PSOE) as allegations of misconduct grow.
The court is particularly examining text messages exchanged between Serrano and Leire Diez, related to potential disruptions in official investigations, an activity both deny participating in.
(With inputs from agencies.)