Here is the Montana Republican Party’s brief in Ravalli County Republican Central Committee v McCulloch, now pending in the Ninth Circuit. The issue is whether the state can force the Republican Party to choose its precinct committee officers in a primary in which any voter may participate. The U.S. District Court had refused to enjoin the law, so the Republican Party is asking the Ninth Circuit for relief.
The state has been given permission to delay its response until April 29.