OKLAHOMA CITY (AP) — Voters who head to the polls Tuesday for a special primary election in Oklahoma City will be required to bring proof of identity under a new law that went into effect last month.

The election for a vacant Senate seat that includes portions of southern Oklahoma County and northern Cleveland County is the first state election since nearly 75 percent of Oklahoma voters approved the voter ID law in November.

Republicans Theresa Nelson of Oklahoma City and Greg Childers of Del City are seeking the seat being vacated by Republican Jim Reynolds. Reynolds stepped down earlier this year to become Cleveland County treasurer.

The winner of Tuesday's primary will face Democrat Kenneth Meador of Moore in an Oct. 11 special general election.