S.C. Code Ann. § 7-1-110

(A) The President of the Senate, on behalf of the Senate, and the Speaker of the House of Representatives, on behalf of the House of Representatives, have an unconditional right to intervene on behalf of their respective bodies in a state court action that challenges the validity of an election law, an election policy, or the manner in which an election is conducted. (B) In a federal court action that challenges the validity of an election law, an election policy, or the manner in which an election is conducted, the President of the Senate, on behalf of the Senate, and the Speaker of the House of Representatives, on behalf of the House of Representatives, have standing to intervene as a party on behalf of their respective bodies, to file an amicus brief, or to provide evidence or argument, written or oral, in accordance with the federal rules of procedure, irrespective of whether any other officer of the State has appeared in the action. (C) A federal court presiding over an action that challenges the validity of an election law, an election policy, or the manner in which an election is conducted is requested to allow the President of the Senate, on behalf of the Senate, and the Speaker of the House of Representatives, on behalf of the House of Representatives, to intervene in any such action as a party. (D) A request to intervene or the participation of the President of the Senate, on behalf of the Senate, or the Speaker of the House of Representatives, on behalf of the House of Representatives, as a party or otherwise, in an action that challenges the validity of an election law, an election policy, or the manner in which an election is conducted does not constitute a waiver of: (1) legislative immunity or legislative privilege for any individual legislator, legislative officer, or legislative staff member; or (2) sovereign immunity or any other rights, privileges, or immunities of the State that arise under the United States Constitution or the South Carolina Constitution. (E) The State Election Commission and the Attorney General must notify the President of the Senate and the Speaker of the House of Representatives within twenty-four hours of the receipt of service of a complaint that challenges the validity of an election law, an election policy, or the manner in which an election is conducted. (F) In an action in which the Senate or the House of Representatives intervenes or participates pursuant to this section, the Senate and the House of Representatives must function independently from each other in the representation of their respective bodies, unless otherwise agreed to by the President of the Senate and the Speaker of the House of Representatives. (G) The Senate and the House of Representatives may employ attorneys other than the Attorney General to defend any action that challenges the validity of an election law, an election policy, or the manner in which an election is conducted. (H) The President of the Senate, on behalf of the Senate, and the Speaker of the House of Representatives, on behalf of the House of Representatives, have standing to bring an action in mandamus in the original jurisdiction of the Supreme Court to compel an election official to faithfully apply, enforce, and defend the election laws of the State.