The party disqualified Kelly McGinley last week from running for the school board seat from south Alabama, citing her support for the Constitution Party.
McGinley is an outspoken supporter of former Supreme Court Chief Justice Roy Moore, who was removed from office after refusing a federal court order to move a Ten Commandments monument.
The lawsuit was filed in circuit court in Montgomery by McGinley's attorney, Johnny Davis of Ozark. Davis said in a statement that the lawsuit seeks an emergency order to return McGinley to the ballot for the June first Republican Primary.
The lawsuit claims that McGinley met every qualification and the Republican party violated its bylaws in disqualifying her from the race.
Incumbent Orange Beach businessman Randy McKinney is now unopposed in the GOP primary for the school board seat.
No Democrat qualified to run for the seat in the November general election.