TOPEKA, Kan. (AP) — The American Civil Liberties Union is asking a Kansas judge to bar Secretary of State Kris Kobach from starting what the group calls a dual voting system to help enforce a proof-of-citizenship requirement.

The ACLU filed a request Friday with Shawnee County District Judge Franklin Theis (tys) for a temporary injunction to keep Kobach from imposing a new election policy for the state’s Aug. 5 primary.

Kobach has said the relative handful of Kansas residents who register to vote using a national form will be allowed to complete full ballots at the polls, but only their votes in congressional races will be counted.

The national registration form does not require voters to submit documentation of their U.S. citizenship. The state’s registration form does.