In a searing letter sent to the U.S. Anti-Doping Agency Review Board on Friday, cycling icon Lance Armstrong made it clear he intends to fight the agency's allegation he participated in a vast doping conspiracy while winning his seven Tour de France titles.

In the 11-page letter signed by Armstrong's attorney, Robert D. Luskin, Armstrong asked the agency's independent review board to reject the charges made by USADA or suspend consideration of the matter until the agency provides evidence to back up allegations made in a June 12 letter to Armstrong.

Armstrong's response claims USADA made unsupported or flatly false allegations in its letter that are "offensive to any notions of due process and fair play."

Armstrong's letter indicates he hopes to stave off claims against him within USADA's own system.

"USADA's overly expansive view of its own authority — not to mention smug self-regard — undoubtedly explains its threadbare charging document, its arrogant and craven refusal to disclose its evidence, and its complacent expectation that the Review Board will not hold it accountable," the letter stated.

The review board evaluates the agency's evidence before USADA issues any punishment or the matter goes to arbitration. USADA can reject the recommendation of its review board if it chooses.

Because USADA charged Armstrong with doping violations between 1998 and 2005, all of Armstrong's seven Tour titles are in jeopardy should he be found guilty.

Armstrong, 40, has never tested positive.