The testimony of any witness in a foreign country may be taken either on oral or written interrogatories, or on interrogatories partly oral and partly written, pursuant to a commission issued, as hereinafter provided, for the purpose of determining whether any foreign documents sought to be used in any criminal action or proceeding in any court of the United States are genuine, and whether the authentication requirements of the Federal Rules of Evidence are satisfied with respect to any such document (or the original thereof in case such document is a copy). Application for the issuance of a commission for such purpose may be made to the court in which such action or proceeding is pending by the United States or any other party thereto, after five days’ notice in writing by the applicant party, or his attorney, to the opposite party, or his attorney of record, which notice shall state the names and addresses of witnesses whose testimony is to be taken and the time when it is desired to take such testimony. In granting such application the court shall issue a commission for the purpose of taking the testimony sought by the applicant addressed to any consular officer of the United States conveniently located for the purpose. In cases of testimony taken on oral or partly oral interrogatories, the court shall make provisions in the commission for the selection as hereinafter provided of foreign counsel to represent each party (except the United States) to the criminal action or proceeding in which the foreign documents in question are to be used, unless such party has, prior to the issuance of the commission, notified the court that he does not desire the selection of foreign counsel to represent him at the time of taking of such testimony. In cases of testimony taken on written interrogatories, such provision shall be made only upon the request of any such party prior to the issuance of such commission. Selection of foreign counsel shall be made by the party whom such foreign counsel is to represent within ten days prior to the taking of testimony or by the court from which the commission issued, upon the request of such party made within such time.