Texas Attorney General Ken Paxton filed a lawsuit against the Biden administration’s Department of Homeland Security on Tuesday, accusing federal officials of failing to cooperate in preventing noncitizens from voting in the 2024 election.

The lawsuit, filed in a Texas federal court, claims DHS has withheld critical data on approximately 450,000 voters whose citizenship status has never been verified because “they registered without a State of Texas-issued driver’s license or identification card,” according to a press release announcing the lawsuit.