Gov. Scott Walker answers questions Monday after a news conference about job growth at Connecture, a Waukesha-based firm. Credit: Rick Wood

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Gov. Scott Walker acknowledged Monday that prosecutors initiated the meeting they will have with him as part of the John Doe investigation about activities that occurred during Walker's tenure as Milwaukee County executive.

"Up until now, we've provided written documentation (from the campaign)," Walker said during a briefing with reporters in Waukesha. "They'd like to talk to us about what they've found and what additional help we can provide."

Walker announced last week that he had hired two criminal defense attorneys and would be voluntarily meeting with Milwaukee County District Attorney John Chisholm regarding the John Doe investigation.

Prosecutors have charged four former Walker aides and appointees with various crimes, including theft and misconduct in office.

In his five-minute briefing Monday, the first-term governor wouldn't say when he was to meet with Chisholm, except that the sit-down would not occur Monday.

"That's up to the district attorney to announce," he said.

Walker did say he wasn't subpoenaed to appear before the John Doe or to talk to prosecutors.

He said the meeting represented the "next logical step" in terms of his cooperation with the investigation. Chisholm subpoenaed Walker's campaign emails in 2010.

"They would like to talk to us about it, but we voluntarily set it up," Walker said.

He brushed aside questions about how he is paying his two defense attorneys - Michael Steinle and John Gallo - though he indicated he is not using tax dollars.

Steinle is veteran criminal defense lawyer whose grandfather was a state Supreme Court justice and father was best known for representing Milwaukee crime boss Frank Balistrieri.

Gallo is a former federal prosecutor now with the Chicago firm Sidley Austin. Gallo represents criminal defendants and grand jury targets, according to his listing on his firm's website.

Federal court records in Delaware show other partners at the firm with similar years of experience as Gallo bill $675 to $975 an hour. Sidley Austin was ranked as one the largest law firms in the country by revenue, according to the publication American Lawyer. Sidley Austin had 2010 revenue of $1.34 billion, or eighth-best in the country.

Jason Stein and Patrick Marley, reporting from Madison, and Cary Spivak, reporting from Milwaukee, contributed to this report.