On April 28, the Ninth Circuit cancelled the May 4 scheduled oral argument in Ravalli County Republican Central Committee v McCulloch. This is the lawsuit filed by ten Montana county Republican parties against the open primary, as applied to the Republican Party. It seems likely this case will be held in abeyance until the Hawaii Democratic Party case is decided.
So it seems the Democrats are split on this issue. The Montana Democrats don’t want Republicans to close their primaries yet it’s the opposite in Hawaii.