ANKARA, Turkey (AP) — Turkey’s prime minister has threatened drastic steps to censor the Internet, including shutting down Facebook and YouTube, where audio recordings of his alleged conversations suggesting corruption have been leaked in the past weeks, dealing him a major blow ahead of this month’s local elections.

In a late-night interview Thursday, Recep Tayyip Erdogan told ATV station that his government is determined to stem the leaks he insists are being instigated by followers of an influential U.S.-based Muslim cleric. He has accused supporters of Fethullah Gulen of infiltrating police and the judiciary and of engaging in “espionage,” saying that the group even listened in on his encrypted telephone lines. The Gulen movement denies involvement.