Walker said he has complied with laws restricting public officials from mingling their official duties with campaign activity ever since he's been governor, the Milwaukee Journal Sentinel reported.
Walker again refused to say whether as county executive he knew of or used a secret email system available in his office to avoid public spotlight, the newspaper said.
On the final day of the National Governors Association's winter meeting, Walker was asked to comment on a massive "document dump" of court records arising from a 2010 investigation by Milwaukee County District Attorney John Chisholm. The investigation led to the conviction of six people, including three one-time aides for Walker.
Walker told the Journal Sentinel it could become a "slippery slope" for him to discuss specifically the more than 27,000 records released last week because "once you start on one thing, then there's hundreds of questions on each of those."
The newly released documents tied Walker to a secret email system used by aides and indicate close ties between campaign staff and the county executive's taxpayer-paid staff in the run-up to Walker's election as governor in 2010. Walker wasn't charged and records don't indicate he did anything wrong.
Walker -- who has retained counsel and established a legal defense fund -- suggested he has been diligent about not blurring lines between campaigning and official business.
"Other governors ... would get their cabinet members to do fundraisers for them. My response is good policy is good politics," Walker told the Journal Sentinel. "The best way they can help me is going out and doing a good job in their respective jobs, and then I leave the campaign staff to do the political work."