On September 4, the Republican Party of Texas filed a federal lawsuit to obtain a closed primary for itself. Hunt v State, n.d. 2:25cv-200. Here is a link to a news source that has a link to the Complaint. Texas has always had open primaries, ever since primaries have existed in Texas. The Complaint prominently mentions the Idaho Republican Party’s lawsuit that succeeded in getting a closed primary for the Idaho Republican Party. But it does not mention other cases in which federal courts ruled against parties that had filed similar lawsuits. Such cases were filed by the Democratic Parties of Hawaii and Mississippi, and Republican Parties of Montana, Virginia and South Carolina.
The case is assigned to U.S. District Court Judge Matthew Kacsmaryk in the Amarillo Division of the Northern District. More than 95% of all cases filed in that Division go to Judge Kacsmaryk. Republicans frequently file in the Amarillo Division because Judge Kacsmaryk is considered to be strong Republican partisan. One of the plaintiffs lives in that Division; if he weren’t in the case, the case couldn’t be filed in that Division.