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Madison — A federal judge on Tuesday ordered that a small set of documents be made publicly available in the lawsuit over an investigation into cooperation between conservative groups and the campaign of Gov. Scott Walker.

Judge Diane Wood of the U.S. 7th Circuit Court of Appeals in Chicago ordered the court clerk to make available to the public two attachments to a motion that the Wisconsin Club for Growth had wanted to seal.

Her order did not say when the records would be available or make clear what they contain. They appear to total 14 pages, according to online court records.

The order is the latest in a series of decisions that has caused immense secrecy around the probe to fall away.

Last month, a different judge on that court ordered the unsealing of more than 250 pages of documents that had been partially blacked out, including ones that detailed prosecutors' theory that Walker was involved in a "criminal scheme." No one has been charged, a federal judge in Milwaukee has halted the probe and an attorney for the special prosecutor leading it said soon after the documents were released that Walker is not a target.

Also last month, a state judge ordered a huge swath of documents from an earlier, related probe to be turned over to Milwaukee County Executive Chris Abele. Many of those documents will be available to the public under the state's open records law. And in February, more than 27,000 pages of emails from one former Walker aide, Kelly Rindfleisch, became available as part of her appeal of a conviction of misconduct in office.

Other details have become available through five lawsuits related to the probe, most of them filed by targets against prosecutors and Reserve Judge Gregory Peterson, who is overseeing the investigation.

Milwaukee County District Attorney John Chisholm, special prosecutor Francis Schmitz and others launched the John Doe probe to look into whether campaign finance laws were violated as the Wisconsin Club for Growth and other conservative groups worked to help Walker and other Republicans.

John Doe investigations allow prosecutors to compel people to testify and turn over documents and bar them from speaking publicly about the matter.

The Wisconsin Club for Growth and one of its directors, Eric O'Keefe, sued prosecutors in federal court in February, alleging the investigation was a partisan witch hunt that violated their rights to free speech. Chisholm is a Democrat, though Schmitz has said he is a Republican who voted for Walker.

U.S. District Judge Rudolph Randa sided with the club in May and ordered a halt to the probe.

Prosecutors are appealing that ruling, and the appeals judge on Tuesday ordered that a recent filing by the club could not be sealed.

The three-judge panel hearing the appeal has ordered briefs to be filed in the case through Oct. 2, meaning the case will likely remain an issue throughout Walker's re-election campaign. In November, he is expected to face Democrat Mary Burke, a former state commerce secretary and former Trek Bicycle Corp. executive.