WICHITA, Kan. (AP) — Civil rights groups are calling on Kansas Secretary of State Kris Kobach to rescind instructions telling local election officials to throw out votes in local and state races cast by tens of thousands of people who register at motor vehicle offices without proving U.S. citizenship.

The organizations wrote a letter Tuesday noting a Kansas judge has already twice ruled Kobach lacks the legal authority to operate such a two-tiered election system.

Their letter says that for him to disregard the court’s rulings and knowingly operate an illegal system shows a “troublingly cavalier attitude” toward the rule of law and disrespect for voters.

Kobach did not immediately respond to an email seeking comment.

Micah Kubic, executive director of the American Civil Liberties Union, says Kobach is “deliberately creating chaos” for voters.