Lance Armstrong has filed a lawsuit aimed at preventing the US Anti-Doping Agency from moving ahead with charges that he used performance-enhancing drugs during his record-breaking career.
Armstrong's lawsuit says Usada rules violate athletes' constitutional right to a fair trial, and that the agency doesn't have jurisdiction in his case.
It also accuses Usada's chief executive, Travis Tygart, of waging a personal vendetta against the cancer survivor who won the Tour de France every year from 1999 to 2005.
The lawsuit is an aggressive - and expected - move as Armstrong seeks to preserve his legacy as one of the greatest cyclists ever and an inspiring advocate for cancer survivors and research.
Armstrong wants a judge to bar Usada from pursuing its case or issuing any sanctions against him.
Armstrong asked the court to issue an injunction by Saturday, the deadline he faces to formally challenge the case in Usada's arbitration process or accept sanctions.
He could receive a lifetime ban from cycling and be stripped of his Tour de France victories if found guilty.
Armstrong insists he is innocent.
More to follow