Special counsel Robert Mueller is asking a federal court in Virginia for 100 more blank subpoenas in the case against Paul Manafort, President Donald Trump's former campaign manager.

The request came in a filing Wednesday that was posted by The Hill.

The subpoenas require the recipient to testify in the U.S. District Court in Alexandria, Virginia, on July 25, when Manafort's trial on bank and fraud charges is set to begin. No further information was provided in the filing.

In May, court documents showed Mueller had filed for 70 blank subpoenas. And the special counsel asked for 150 blank subpoenas in June, the Washington Examiner reported.

The latest request comes amid an effort by Manafort's defense team to delay the trial and move it from Alexandria to Roanoke, Virginia.

The judge overseeing the Alexandria case, T.S. Ellis, declined a request Wednesday from Manafort to stay at the regional jail where he has reportedly being treated like a VIP, and ordered him to be moved to behind bars in Alexandria.