(ii) Extension (I) In general The Attorney General may petition the court for an extension of the stay for additional 180-day periods. (II) Recertification A court may grant an extension under clause (I) if the Secretary of State recertifies that the United States remains engaged in good faith discussions with the foreign state defendant or any other defendant concerning the resolution of a claim against the foreign state or any official, employee, or agent of the foreign state, as to whom a stay of claims is sought. (d) Dismissal of actions following foreign state agreement (1) Intervention The Attorney General may intervene in any action in which a foreign state is subject to the jurisdiction of a court of the United States under this section for the purpose of seeking the dismissal of the case. (2) Dismissal with prejudice A court of the United States may dismiss with prejudice a proceeding under this section against a foreign state or any official, employee, or agent of the foreign state if the Secretary of State certifies that the United States and the foreign state have entered into an agreement with respect to the resolution of a claim against such a defendant, regardless of whether the plaintiff is a party to such agreement or consents to the dismissal. (e) Severability If any provision of this Act or any amendment made by this Act, or the application of a provision or amendment to any person or circumstance, is held to be invalid, the remainder of this Act and the amendments made by this Act, and the application of the provisions and amendments to any other person not similarly situated or to other circumstances, shall not be affected by the holding. (f) Rule of construction A foreign state shall not be subject to the jurisdiction of the courts of the United States under this section on the basis of a tortious act or acts that constitute mere negligence. (g) Application date The amendments made by this Act shall apply to a civil action— (1) pending on, or commenced on or after, the date of enactment of