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The arbitration panel could meet by November, USADA said, but Luskin hinted Armstrong may file a federal lawsuit in an attempt to stop or delay the USADA investigation.

Mr. Armstrong is exploring all his legal options,” Luskin said.

Earlier in the day, Armstrong had gone on the attack against one of the review board members, Minneapolis attorney Clark Griffith, using his Twitter account to note that Griffith had earlier this year been charged in a misdemeanor case of indecent exposure.

“Wow. (at)usantidoping can pick em. Here’s … 1 of 3 Review Board members studying my case,” Armstrong tweeted, linking to an online story about Griffith.

Griffith entered an Alford plea on June 13. Under the plea, Griffith did not admit doing anything wrong but acknowledged prosecutors have enough evidence for a jury to convict him. A 24-year-old student reported Griffith unzipped his pants in front of her on a St. Paul street.

Sentencing is scheduled for July 26. Griffith told the AP he’s innocent and entered the plea to avoid a trial that would embarrass his family.

Griffith said Armstrong’s tweet was “an effort to get away from the issues that will be dealt with by an arbitration panel. OK? By smearing me, that does nothing. I’m innocent of that.”

USADA has not publicly released most of its evidence against Armstrong. Griffith would not discuss Armstrong’s case in detail but said, “He’s really scrambling …. I can’t wait to hear what the arbitration panel thinks of the evidence.”