Milwaukee County prosecutors have spent the past 27 months looking into a variety of campaign and other issues from Walker's tenure as Milwaukee County executive.

So far, one former Walker aide from Milwaukee County has pleaded guilty to two misdemeanors for raising campaign funds in the courthouse. Three other ex-Walker aides and appointees in Milwaukee County have been charged with felonies. All have pleaded not guilty.

But the new records confirm that prosecutors are also seeking information from Walker's state administration and did so as recently as June, after Walker's victory as the first governor in the nation's history to win a recall election.