Walker's campaign released the ad Friday morning, less than 24 hours after the documents were released in conjunction with an ongoing lawsuit by Wisconsin Club for Growth challenging the investigation.
Walker's 30-second ad titled "Bad Hand" is running statewide. The liberal group One Wisconsin Now says Walker is spending nearly $250,000 on the spot, which blasts Burke's record as state Commerce secretary under Democratic Gov. Jim Doyle.
Burke spokesman Joe Zepecki says it's no surprise Walker is hitting the airwaves to attack Burke "with his campaign under siege."
Watch the ad: