Rep. Anna Paulina Luna (R-FL) is threatening to “shut down” the House over an election bill Senate Republicans have yet to vote on, presenting Speaker Mike Johnson (R-LA) with yet another headache caused by his own party.

Luna, who has repeatedly used Republicans’ narrow House majority to extract concessions from leadership, announced on X Friday that she has enough members to grind floor business to a halt over legislation that mandates voters verify their citizenship status before casting a ballot in elections. The bill, known as the SAVE Act, already passed the House in April, but Luna and other Republicans have grown impatient with the lack of action in the Senate.