HARRISBURG — The wife of Pennsylvania’s lieutenant governor has entered a residential treatment facility for a mental health issue amid fallout from complaints about the couple’s behavior toward state employees.

A spokesman for Democratic Lt. Gov. Mike Stack says Tonya Stack is receiving care “regarding a difficult mental health issue.”

Chief of staff Matt Franchak said in a statement Thursday the Stacks are like many families that face mental illness and are addressing it “in a comprehensive way.”

Democratic Gov. Tom Wolf initiated an inspector general’s investigation into the complaints about the Stacks’ treatment of employees. Stack said his behavior was unacceptable and a symptom of a larger problem but didn’t elaborate.