of a State, or an official or agency 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 section 2(a), the State may 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), an attorney general, official, or agency of a State, before initiating a civil action under paragraph (1), shall provide written notification to the Commission that the attorney general, official, or agency 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 an attorney general, official, or agency of a State to provide the notification required under clause (i) before initiating a civil action under paragraph (1), the attorney general, official, or agency 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 an attorney general, official, or agency of a State under paragraph (1)