TOPEKA, Kan. (AP) — Attorneys in a federal lawsuit challenging Kansas’ proof of citizenship voting law want to add another plaintiff to the case in their bid to make it a class action lawsuit.

The lawsuit challenges the constitutionality of a 2013 Kansas law requiring new voters to document their U.S. citizenship when registering.

The Lawrence Journal-World reports lawyers for the plaintiffs filed a motion recently to add a 20-year-old Kansas University student, Parker Bednasek, as a plaintiff. If approved, he’d serve as a representative of all members of the class of people whose voter registrations are being blocked for failure to show valid proof of U.S. citizenship.

A spokesman for Kansas Secretary of State Kris Kobach says their attorneys will ask for an extension of time to respond to the latest motion.