Special counsel Robert Mueller on Thursday filed a request for 70 blank subpoenas in the Eastern District of Virginia, where former Trump campaign chairman Paul Manafort lives.

The two-page filing reveals little, but says that that each subpoena recipient must appear in the Alexandria, Va., courthouse on July 10 to testify in the case.

The 70 blank subpoenas amount to 35 total possible subpoenas — in each case, a subpoena is needed for the witness and another is needed for the defense. Court documents filed in April show that Mueller's team was pushing to subpoena 35 witnesses in the trial.

A blank subpoena means the party serving the subpoena, in this case the federal government, can fill in the name later, as long as it is done so before the subpoena is served.

The document says each recipient “must also bring with you the following documents, electronically stored information or objects” — but what follows the colon is under seal.

[Also read: House resolution tells Robert Mueller: Show evidence of Trump-Russia collusion or end the investigation]

In Virginia, Manafort is facing charges including tax fraud and failing to report foreign bank accounts.

He is facing separate charges from Mueller in Washington, which include conspiracy to launder money and failure to register as a foreign agent.

Manafort — who has pleaded not guilty in both cases — will be in court in Alexandria Friday, where his defense team will argue that the charges Mueller has brought are outside the scope of his authority.