The Spanish press has been scathing about the party's apparent inaction, and the normally supportive newspaper El Mundo said on its front page Saturday that the impression the Popular Party is giving is that it is "debating whether to cover up the secret payments or investigate them."
Barcenas resigned as party treasurer in 2009, some months after the investigation began, and he has not been charged with any crime. Barcenas' lawyer, Alfonso Trallero, has denied the money was illegally obtained or linked to the Popular Party.
While still in opposition, before taking office in November, Rajoy often showed public support for Barcenas.
The court revelations led to impromptu street protests in Madrid and Barcelona on Friday and Saturday.