The law firm that produced the Mitchell Report investigating performance-enhancing drugs in baseball is fighting former pitching star Roger Clemens over access to evidence it collected.

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DLA Piper filed a motion in federal court Friday to quash Clemens' subpoena for material it collected accusing the pitching great of using steroids and human growth hormone. In 2006, Major League Baseball Commissioner Bud Selig hired former Sen. George Mitchell, then a partner at the firm, to investigate allegations that players used drugs.

The firm says it has 20 documents requested by the subpoena that are covered by attorney-client privilege, including notes taken during interviews and memos describing what witnesses said. The firm reported that it has turned over a declaration from one of its attorneys and four "items of correspondence" to Clemens.