a civil action in the appropriate district court of the United States against the employer within 180 days of the violation. No relief under this subsection shall be denied on the basis that the employee is, or was during the time of relevant employment or during the back pay period, an unauthorized alien as defined in section 274A(h)(3) of the Immigration and Nationality Act ( 8 U.S.C. 1324a(h)(3) ) or any other provision of Federal law relating to the unlawful employment of aliens. (2) Available relief Relief granted in an action under paragraph (1) may include— (A) back pay without any reduction, including any reduction based on the employee’s interim earnings or failure to earn interim earnings