The Missouri Republican State Committee is backing closed primaries.
Members during the state GOP convention this past week in Branson passed in a voice vote a resolution in favor of requiring primary voters to register with a party.
Under the current system, Democrats can vote in GOP primaries and Republicans can vote in Democratic primaries.
Missouri lawmakers would need to pass legislation to require party registration for primaries. The 2016 legislative session ended earlier this month, and the next session begins in January.
Missouri GOP chairman John Hancock says the change would help block Democrats from tampering with Republican primaries and vice versa.
Democratic state committee chairman Roy Temple says he hasn't heard of any formal proposals regarding registration for primaries.
