Gov. Parson signed House Bill 1878 overhauling Missouri’s election rules and eliminating the state’s presidential primaries in favor of a caucus system.

The new law requires voters to present a photo ID when casting a regular or absentee ballot and replaces the presidential primary held in March with a series of caucuses.

House Bill 1878 is effective August 28, in time for the November general election but not until after the August 2 primary election.