). (C) Authority preserved Nothing in this Act shall be construed to limit the authority of the Commission under any other provision of law. (D) Rulemaking The Commission shall promulgate in accordance with section 553 of title 5, United States Code, such additional rules as may be necessary to carry out this Act. (b) Enforcement by States (1) In general If the attorney general of a State has reason to believe that an interest of the residents of the State has been or is being threatened or adversely affected by a practice that violates this Act or a regulation promulgated thereunder, the attorney general of the State may, as parens patriae, bring a civil action on behalf of the residents of the State in an appropriate district court of the United States to obtain appropriate relief. (2) Rights of Commission (A) Notice to Commission (i) In general Except as provided in clause (iii), the attorney general of a State, before initiating a civil action under paragraph (1), shall provide written notification to the Commission that the attorney general intends to bring such civil action. (ii) Contents The notification required under clause (i) shall include a copy of the complaint to be filed to initiate the civil action. (iii) Exception If it is not feasible for the attorney general of a State to provide the notification required under clause (i) before initiating a civil action under paragraph (1), the attorney general shall notify the Commission immediately upon instituting the civil action. (B) Intervention by Commission The Commission may— (i) intervene in any civil action brought by the attorney general of a State under paragraph (1)