Scott Walker is likely a prosecutorial target in a federal investigation
Update: Source: FBI "Equal Partner" in John Doe Investigation, Aided in Brett Davis Search
A fact for future reference, James L. Santelle is the U.S. Attorney for the Eastern District of Wisconsin.
The Financial Fraud and Public Corruption Section handles matters involving corruption by public officials.
Richard G. Frohling is the Chief, Criminal Division US Attorney's Office, Eastern District of Wisconsin.