Wisconsin Gov. Scott Walker has appointed a new transportation secretary as he gears up for a budget battle over how to pay for roads.
Walker announced Tuesday that he has appointed Department of Safety and Professional Services Secretary Dave Ross to serve as secretary of the Department of Transportation. Ross replaces Mark Gottlieb, who plans to resign effective Jan. 6.
Walker's announcement didn't offer any explanation for Gottlieb's resignation. Walker spokesman Tom Evenson said in an email to The Associated Press that Gottlieb plans to retire.