Tim Russell, a former campaign and county aide to Gov. Scott Walker, was arrested by authorities on Thursday as part of the ongoing John Doe investigation into Walker staffers, sources said.

No details on the reason for the arrest were immediately available.

Milwaukee County District Attorney John Chisholm announced Thursday that his office would be making an announcement at noon about additional charges in the secret probe. Chisholm’s office has been overseeing the investigation for more than 1 1/2 years. 

(Source: wisconsinforward)