The decision Friday is a victory for the league of women voters and others who are suing over the new political boundaries approved in 2012. They argue that the republican controlled legislature didn't follow a constitutional amendment that says it can't draw districts intended to protect incumbents or members of a certain political party.
The groups are hoping lawmakers can be questioned about the process. Lawyers representing the house and senate had argued such a move would violate a long-standing privilege that shields legislators from testifying in lawsuits.
The court agreed that privilege exists, but not when the constitution directs their behavior.