MADISON, Wis. — Newly released court documents raise old concerns that Judge Barbara A. Kluka, the original presiding judge in a politically charged John Doe investigation into conservatives, was nothing more than a rubber stamp for prosecutors on the hunt for Gov. Scott Walker and friends.

“Judge Kluka provided no meaningful oversight over this John Doe proceeding,” wrote attorneys for conservative targets of the Democrat-launched probe in arguments before the 7th Circuit U.S. Court of Appeals.

The 144-page brief, filed last week in front of Tuesday’s oral arguments before the appeals court, lays out the arguments of political activist Eric O’Keefe and the Wisconsin Club for Growth, plaintiffs in a civil rights lawsuit against the investigation’s prosecutors. They ask that the 7th Circuit uphold U.S. District Court Judge Rudolph Randa’s preliminary injunction that shut down the secret John Doe probe into dozens of conservative groups, and support Randa’s denial of the prosecutors’ motions to dismiss the federal lawsuit.