of the Secretary be modified or set aside in whole or in part. A copy of such petition shall be forthwith transmitted by the clerk of the court to the Secretary, or any officer designated by the Secretary for that purpose, and thereupon the Secretary shall file in the court the record upon which the order complained of was entered, as provided in section 2112 of title 28. Upon the filing of such petition such court shall have exclusive jurisdiction to affirm, modify, or set aside such order, in whole or in part. No objection to the order of the Secretary shall be considered by the court unless such objection shall have been urged before the Secretary or unless there were reasonable grounds for failure so to do. The finding of the Secretary as to the facts, if supported by substantial evidence, shall be conclusive. If any party shall apply to the court for leave to adduce additional evidence, and shall show to the satisfaction of the court that such additional evidence is material and that there were reasonable grounds for failure to adduce such evidence in the proceeding before the Secretary, the court may order such additional evidence to be taken before the Secretary and to be adduced upon the hearing in such manner and upon such terms and conditions as to the court may seem proper. The Secretary may modify their findings as to the facts by reason of the additional evidence so taken, and they shall file with the court such modified or new findings, which, if supported by substantial evidence, shall be conclusive, and their recommendation, if any, for the modification or setting aside of the original order. The judgment and decree of the court affirming, modifying, or setting aside, in whole or in part, any such order of the Secretary shall be final, subject to review by the Supreme Court of the United States upon certiorari or certification as provided in section 1254 of title 28. The commencement of proceedings under this subsection shall, unless specifically ordered by the court to the contrary, operate as a