MADRID: Tens of thousands of people rallied Sunday in an opposition-organized demonstration in Madrid accusing the government of Prime Minister Pedro Sanchez of corruption.

Protesters, many waving red and yellow Spanish flags, massed in the Plaza de Espana, a large square in the center of the Spanish capital, and chanted “Perdo Sanchez, resign!.”

The Popular Party (PP) called the rally after leaked audio recordings allegedly documented a member of the Socialist party, Leire Diez, waging a smear campaign against a police unit that investigated graft allegations against Sanchez’s wife, brother, and his former right-hand man.

Diez has denied the allegations, telling reporters on Wednesday that she was conducting research for a book and was not working on behalf of the party or Sanchez. She also resigned from Sanchez’s Socialist party.

PP leader Alberto Nunez Feijoo has accused the government of “mafia practices” over the affair, and said Sanchez is “at the center” of multiple corruption scandals.