The Brief The Texas Republican Party is suing to change state primary elections from open to closed, which would require voters to be registered as Republicans to participate in a Republican primary. The Texas Republican Party wants to change the rules on who can vote in primary elections. The party is suing to require a closed primary, meaning only registered Republicans would be allowed to vote in a Republican primary. But Texas Republicans want to change that in favor of a closed primary. He explained that some in the Texas Republican Party believe Democrats and Independents voted in past Republican primaries to impact the outcomes.