The Denver Post reports a group of Republican activists on the party’s governing body is attempting to block the state’s 1.4 million unaffiliated voters from casting ballots to pick the party’s candidates – a move GOP leaders and elected officials oppose because it could hurt their chances in the all-important November election.

Colorado will allow unaffiliated voters to participate in the June party primaries for the first time in June 2018, but the new law allows political parties to opt out, cancel the primary and instead select candidates through a caucus process.