Rhode Island unions have made good on a threat to challenge the state's new landmark pension law.

Four lawsuits were filed in superior court today, but Judge Sarah Taft-Carter on Friday denied the union's request to block the changes from taking effect July 1.

The law halts pension increases, raises retirement ages, and merges future pensions with 401-K accounts.

Robert Walsh, director of the National Education Association-Rhode Island, says the changes are unfair and violate the state Constitution.
    
Gov. Lincoln Chafeesays he expected the lawsuits. He and Raimondo crafted the changes and helped push them through the General Assembly last fall.

It became law this fall.