“§ 2516 "(1) The Attorney General, or any Assistant Attorney General specially designated by the ttorney General, may authorize an application to a Federal judge of competent jurisdiction for, and such judge may grant inconformity with section 2518 of this chapter an order authorizing or approving the interception of wire or oral communications by the Federal Bureau of Investigation, or a Federal agency having responsibility for the investigation of the offense as to which the application is made, when such interception may provide or has provided evidence of-