Trump cannot easily bring an end to the Russia investigation by firing Special Counsel Robert Mueller. …Deputy Attorney Rod Rosenstein, not …Trump, is the one who has authority to fire Mueller. …Trump might compel others to do so on his behalf or instruct the attorney general to revoke DOJ’s special counsel regulations, [but] the risks of doing so are prohibitive. History warns that he would be risking his presidency, not to mention increasing his exposure to charges of obstruction of justice. …Any firing could be subject to court challenge by Special Counsel Mueller, his staff, and possibly other parties. Mueller’s firing also would not necessarily bring an end to the investigation that he is leading. …Congress might make it even harder for …Trump to end the Russia investigation by codifying the special counsel regulations and pre-committing to a course of action that would deter interference with the Russia investigation.