PHILADELPHIA — Four Pennsylvania voters are asking the state Supreme Court to invalidate the commonwealth’s closed primary system in an effort to allow unaffiliated voters to cast a ballot in partisan primary elections in the crucial swing state.

Four independent voters in Pennsylvania are asking the state Supreme Court to rule that the closed primary system violates the state constitution

In a legal filing, a group of voters argues closed primaries unconstitutionally leave voters out of contests that often decide general elections.

With Independence Hall in Philadelphia serving as the backdrop, a group announced on Tuesday they have filed a petition asking the state Supreme Court to rule primary election laws in Pennsylvania are unconstitutional.