WICHITA, Kan. (AP) — Civil rights advocates say a Kansas election official is trying to hide materials that undercut his public claim that substantial numbers of noncitizens have registered to vote.

The American Civil Liberties Union obtained the documents as part of its federal civil lawsuit in Kansas challenging the state’s proof-of-citizenship document requirement.

It wants to court to remove the confidential designation Kansas Secretary of State Kris Kobach placed on the materials.

He was photographed taking them into a November meeting with then President-elect Donald Trump, along with a separate draft amendment to the National Voter Registration Act.

Kobach, a gubernatorial candidate, has argued in a court filing that the ACLU’s efforts to publicize them are meant “to annoy, harass and embarrass” him.

Trump named Kobach vice chairman of a national election fraud commission.