Former Ambassador Joseph Wilson has been subpoenaed to testify in Scooter Libby's upcoming criminal trial. However, CREW has filed a challenge to that subpoena. Our press release and the related documents can be found on CREW's website:

As counsel to Valerie Plame Wilson and former Ambassador Joseph Wilson in their civil suit against Vice President Cheney, I. Lewis "Scooter" Libby, Karl Rove and Richard Armitage, Citizens for Responsibility and Ethics in Washington (CREW) has filed a challenge to Ambassador Wilson's subpoena as a defense witness in Mr. Libby's upcoming criminal trial.

CREW filed a motion to quash the subpoena on December 20, 2006 in the U.S. District Court for the District of Columbia. Judge Reggie B. Walton has ordered Mr. Libby to respond to the motion by January 2, 2007, with Mr. Wilson's reply due by January 8, 2007. The matter has been set for oral argument before Judge Walton on January 10, 2007.

Update: The Associated Press has an article on this issue now:

Former ambassador Joseph Wilson asked a federal judge Wednesday not to force him to testify in the CIA leak case and accused former White House aide I. Lewis "Scooter" Libby of trying to harass him on the witness stand.

Libby, who faces perjury and obstruction charges, subpoenaed Wilson as a defense witness this month. Libby's attorney, William Jeffress, said in court Tuesday that was a precautionary move and he did not expect to put Wilson on the stand.