Bush's press secretary Scott McClelland announced today that he has testified before the grand jury investigating the leak of the identity of CIA operative Valerie Plame:

I'm doing my part to cooperate, as the president directed all of us to do," McClellan said aboard Air Force One during Bush's trip to Springfield, Mo.

Now, that's what we call spin.

Update: The New York Times has these details of the grand jury investigation:

In addition to the grand jury appearances, which are believed to include other Bush administration officials, prosecutors have conducted meetings with presidential aides that lawyers in the case described as tense and sometimes combative.

Armed with handwritten White House notes, detailed cellphone logs and copies of e-mail messages between White House aides and reporters, prosecutors have demanded explanations of conversations between aides and reporters for some of the country's largest news organizations that under ordinary circumstances would never be publicly discussed. So far, no reporter has been questioned or subpoenaed.

One set of documents that prosecutors repeatedly referred to in their meetings with White House aides are extensive notes compiled by I. Lewis Libby, Vice President Dick Cheney's chief of staff and national security adviser. Prosecutors have described the notes as "copious," the lawyers said. In addition, the prosecutors have asked about cellphone calls made last July to and from Catherine J. Martin, a press secretary for Mr. Cheney.