HELENA, Mont. -

Montana officials are asking a judge to dismiss a lawsuit challenging a voter-approved law that requires those seeking state services to prove they are eligible to receive them.
    
An immigration-rights group, the state's largest labor union and an immigrant filed the legal challenge after voters approved the initiative in November.
    
The law requires proof of citizenship or legal standing from applicants for services from unemployment and disability benefits to crime-victim assistance.
    
The plaintiffs say the law unconstitutionally requires state agencies to determine who is not in the country legally and turn them over to federal authorities.
    
Solicitor General Lawrence VanDyke argues the plaintiffs have no standing to make their claims because nobody has been injured or threatened by the law.
    
District Judge Jeffrey Sherlock is hearing arguments in the case Thursday.