brought under this paragraph, the district courts shall have jurisdiction to grant all appropriate relief including injunctive relief, compensatory and punitive damages. (B) Civil actions to compel compliance A person on whose behalf an order was issued under paragraph (4) may commence a civil action against the person to whom such order was issued to require compliance with such order. The appropriate United States district court shall have jurisdiction, without regard to the amount in controversy or the citizenship of the parties, to enforce such order. (C) Award of costs authorized The court, in issuing any final order under this paragraph, may award costs of litigation (including reasonable attorney and expert witness fees) to any party, whenever the court determines such award is appropriate. (D) Mandamus proceedings Any nondiscretionary duty imposed by this section shall be enforceable in a mandamus proceeding brought under section 1361 of title 28, United States Code. (d) Unenforceability of certain agreements Notwithstanding any other provision of law, the rights and remedies provided for in this section may not be waived by any agreement, policy, form, or condition of employment, including by any predispute arbitration agreement. (e) Savings Nothing in this subsection shall be construed to diminish the rights, privileges, or remedies of any employee who exercises rights under any Federal or State law or common law, or under any collective bargaining agreement. . (c) Section 203(b) of the Labor-Management Reporting and Disclosure Act of 1959 ( 29 U.S.C. 433(b) ) is amended in the matter following paragraph (2)— (1) by striking the period at the end