……Federal guidelines make it clear that whoever replaces Rosenstein could find ways to adjust the way Mueller works. Those guidelines say the special counsel "shall not be subject to the day-to-day supervision of any official of the department."

But those same guidelines also say his replacement "may request that the Special Counsel provide an explanation for any investigative or prosecutorial step, and may after review conclude that the action is so inappropriate or unwarranted under established departmental practices that it should not be pursued.”

The replacement can also rein in the investigation by disciplinary action for "misconduct and breach of ethical duties under the same standards and to the same extent as are other employees" of the Justice Department, according to the guidelines….

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