Lance Armstrong said Wednesday he was prepared to cooperate in a federal investigation into alleged doping fraud by his former team US Postal -- as long as it does not become a "witch hunt".
Cancer survivor and seven-time Tour de France champion Armstrong's participation on the 2010 edition has been hampered by a series of damning doping allegations levelled by former teammate Floyd Landis.
Landis was stripped of his yellow jersey in 2006 after testing positive for testosterone and spent millions of dollars, and four years, trying to clear his name before confessing to doping two months ago.
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Along with his confessions, however, were claims that Armstrong and several other riders in US Postal were involved in systematic doping practices -- allegations which Armstrong has denied.
On Tuesday the New York Times reported that US authorities have issued grand jury subpoenas to potential witnesses in the probe.
According to the Times report, the subpoenas demonstrate how seriously authorities are taking allegations made by Landis.
When asked to react to the report, Armstrong said: "Like I said, as long as we have a legitimate and credible and fair investigation, we'll be happy to cooperate, but I'm not going to participate in any kind of witch hunt.
"I've done too many good things for too many people."
Accusations of doping have followed Armstrong throughout his career, although the American has never tested positive.
He has questioned the credibility of Landis, mainly because the American lied for four years before confessing to "clear his conscience".
"Would the American people feel like this is a good use of their tax dollars?" said Armstrong.
"That's for them to decide. I don't think the government will build a case on Floyd Landis.
"His credibility left a long time ago."
Armstrong suggested it was up to the sporting authorities, like the International Cycling Union (UCI), United States Anti-Doping Agency (USADA) or the World Anti-Doping Agency (WADA) to decide whether he is clean or not.
"If you think that you have an athlete that's broken the rules -- this is not baseball, this is not football... we have a governing body to deal with that," he said.
"I have had 500 (doping) controls in my day. USADA deals with that, the UCI deals with that. WADA deals with that. We have an agency to deal with that. I have no problem playing by those rules.
"As long as I live I will deny that," he said. "There is absolutely no way I forced people, encouraged people, told people, helped people, facilitated ... Absolutely not. 100 percent."
The federal investigation is being led by Jeff Novitzky, who led a successful probe into the BALCO doping affair resulting in a jail term for perjury for former queen of athletics Marion Jones.
