A former teammate of once acclaimed, now embattled former cyclist Lance Armstrong said Friday that there was no question why U.S. Postal Service team members doped during big races.

"It was done by the team, but it was done for the Tour de France so I could be a good teammate for Lance Armstrong," Tyler Hamilton told CNN on Friday. "He wanted you to be riding your best in the biggest races."

Hamilton, who admits he's not Armstrong's "biggest fan," is one of 26 witnesses who testified to the U.S. Anti-Doping Agency as part of its investigation into doping by Armstrong and other riders on the team.

In its report, released Wednesday, the organization tasked with keeping banned substances out of U.S. Olympic-sanctioned sports said it had uncovered "overwhelming evidence" that Armstrong had participated in and helped run the cycling team's doping program.

Armstrong's lawyer Tim Herman dismissed the USADA report as a "one-sided hatchet job" and a "government-funded witch hunt" against the seven-time Tour de France winner, who has consistently denied doping accusations. Armstrong decided to give up fighting the agency's investigation in August, after a federal judge dismissed a lawsuit he had filed seeking to stop the probe.

Hamilton was one of two former members of Armstrong's cycling team who spoke to CNN Friday about the doping allegations.

Emma O'Reilly, a former part masseuse and part personal assistant to Armstrong and his cycling team, said she hoped her decision to talk about doping -- which she first did nearly a decade ago and more recently through the USADA report -- will help make the sport of cycling better, rather than simply bring Armstrong down.

"I think that now, more than ever, this is the opportunity for riders to have the choice to ride clean and stay clean if they choose to," O'Reilly told CNN.

The USADA sent its report -- chronicling what it called "the most sophisticated, professionalized and successful doping program that sport has ever seen" -- to international cycling authorities, who are considering a request to strip Armstrong of his Tour de France titles and other wins.

And the International Olympic Committee said Friday that it also is examining the agency's evidence to decide if it should consider taking away the bronze medal Armstrong won in the 2000 Sydney Olympics, according to spokesman Andrew Mitchell.

Meanwhile, the RadioShack Nissan Trek cycling team announced Friday that it is parting ways with Johan Bruyneel, who managed the U.S. Postal Service and Discovery racing teams on which Armstrong raced.

In its report, the USADA said "the overwhelming evidence in this case is that Johan Bruyneel was intimately involved in all significant details of the U.S. Postal team's doping program."

Bruyneel is among three former U.S. Postal Service and Discovery team officials who are fighting the charges.

The Radio Shack Nissan Trek team said the mutual decision "is necessary to make this decision since Johan Bruyneel can no longer direct the Team in an efficient and comfortable way."

On his website, Bruyneel said he was "surprised and extremely disappointed" the USADA released its findings before he could review them.

"I still hope to be able to defend myself in a forum free from bias, although I now fear that USADA's calculated action may have irreversibly prejudiced my case," he said.

In her affidavit, released Wednesday, O'Reilly reiterated allegations she first made in a 2003 book "L.A. Confidentiel" by two journalists on allegations against Armstrong.

She told the agency she engaged in clandestine trips to pick up and drop off what she assumed were doping products and said she was in the room when Armstrong and two other team officials came up with a plan to backdate a prescription for corticosteroids for a saddle sore to explain a positive steroid test result during the 1999 Tour de France.

"Now, Emma, you know enough to bring me down," she says Armstrong told her after the meeting.

"The quote has got a bit dramatized," she said. "History has shown that I didn't have enough to bring him down, and I never wanted to bring him down. Never, ever wanted to bring Lance down."