The Turkish government has officially requested that 75-year-old Islamic cleric Fethullah Gulen be temporarily arrested.

Gulen, who has been in self-imposed exile in Pennsylvania since 1999, is wanted by Turkish authorities on charges of leading the July 15 coup attempt by members of the military they claim are Gulen's followers.

The Istanbul Chief Public Prosecutor's office claims it has determined the coup was staged upon order by Gulen. The failed coup left more than 270 people dead, but the Obama administration says it needs evidence of Gulen's direct involvement.

Gulen, who is from Turkey, has denied involvement in the coup attempt.

Turkey also announced that a four-person delegation from the Justice Department will arrive in the country on Aug. 22 to meet with their Turkish government counterparts. They are set to discuss the extradition request of Gulen.

The White House confirmed that Vice President Joe Biden would be visiting during that time as well, Turkey's Prime Minister Binali Yildirim first announced Saturday.

More than 35,00 people have been detained since the coup and subsequent crackdown on alleged supporters of the Gulen movement, while tens of thousands of others have been dismissed from government jobs.