A former state trooper imprisoned for sexually assaulting a girl is still fighting to protect his pension.

Former Maj. Billy Hobbs is challenging a new state law that would allow his pension to be tapped to pay a $325,000 lawsuit judgment won by the girl’s father.

The new law was passed in April after the Nebraska Supreme Court ruled last year that state law protected state benefits from collection actions.

Hobbs’ lawyer has filed a motion to have the law declared unconstitutional, saying it amounts to an ex post facto taking of benefits that Hobbs earned.

The 57-year-old Hobbs gets a monthly pension of more than $3,700, minus more than $1,850 that goes to his ex-wife.