The ultimate answer can probably be found in the debate & testimony re: whatever bill made special counsels possible.
I don't think it is necessary because, technically, the law is written to not make it necessary. If the intention was to make Special Counsels subject to Senate/congressional approval, the language would clearly say that.
There was no bill. There once was a law passed by Congress providing for independent prosecutors, but that law expired.
I don't think it is necessary because, technically, the law is written to not make it necessary. If the intention was to make Special Counsels subject to Senate/congressional approval, the language would clearly say that.
Mueller was not appointed under any Congressional law. He was appointed only under the language of a regulation adopted only by the Department of Justice, not Congress.