KANSAS CITY, Mo. (AP) — Three Democratic U.S. congressmen have asked a federal agency whether a top elections official had the right to unilaterally change voter registration forms in three states to require proof of citizenship.

Reps. Elijah Cummings, Robert Brady and James E. Clyburn asked the chairman of the Election Assistance Commission on Wednesday for records connected to EAC executive director Brian Newby’s amendment of forms in Kansas, Alabama and Georgia.

The group is seeking documents relating to requests from the three states to modify voter registration forms; all analysis of the impact of modifying federal voter registration forms; and all documents giving Newby the authority to unilaterally make the changes.

Voting rights activists criticized the changes Newby made in February as a “secretive move” that created additional barriers for potential voters