Special counsel Robert MuellerRobert (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump MORE is asking for 150 blank subpoenas in the case surrounding former Trump campaign chairman Paul ManafortPaul John ManafortHunter Biden blasts Trump in new book: 'A vile man with a vile mission' Prosecutors drop effort to seize three Manafort properties after Trump pardon FBI offers 0K reward for Russian figure Kilimnik MORE

The request would cover 75 potential subpoenas for witnesses, according to the Washington Examiner, which added that recipients must appear on July 25 to testify.

The request for the subpoenas was filed Tuesday in Virginia, where Manafort resides. 

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The special counsel also filed a request for 70 blank subpoenas in May.

Manafort is facing charges including failing to register as a foreign agent as part of the special counsel's investigation into Russia's election meddling and possible collusion between President TrumpDonald TrumpBiden to move ahead with billion UAE weapons sale approved by Trump Fox News hires high-profile defense team in Dominion defamation lawsuit Associate indicted in Gaetz scandal cooperating with DOJ: report MORE's campaign and Moscow.

He is also facing tax fraud charges and is accused of not reporting foreign bank accounts.  

Mueller, earlier this month, accused Manafort of attempting to tamper with witnesses while on pretrial release. 

Manafort will appear in court Friday, when Mueller's team will argue that he be sent back to jail in light of the allegations of witness tampering.