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Both sides in the high-stakes investigation over coordination between Gov. Scott Walker’s campaign and ostensibly independent political groups will air their dispute Tuesday before a federal appeals court in Chicago, less than two months before the November election.

At issue: Will the so-called John Doe investigation be allowed to continue?

In May, a federal district judge in Milwaukee halted the probe at the request of Wisconsin Club for Growth. The decision by U.S. District Judge Rudolph Randa was appealed by prosecutors and is the subject of Tuesday’s oral arguments before a U.S. 7th Circuit Court of Appeals panel.

The group and one of its directors, Eric O’Keefe, argued that the investigation is illegal because it is aimed at silencing conservative voices in Wisconsin. Prosecutors were violating their civil rights, the group said, by seeking to criminalize political speech protected by the U.S. Constitution.

In a related matter, the judges on Tuesday also will hear a request by Club for Growth and unnamed targets of the investigation to keep certain documents sealed. A media group including the Wisconsin Newspaper Association has requested that all of the records in the case be unsealed.