Please read and share if you want all the details.
The Republican Rosenstein—who appointed the Republican Mueller—was himself appointed by a Republican: Donald Trump.
And when the Republican Rosenstein appointed the Republican Mueller, top Republicans overwhelmingly—again—approved the Republican Rosenstein's choice.
The head of the DOJ—Sessions—is a lifelong Republican, just as the *acting* head (Rosenstein) is.
That means Republicans control every one of the three Trump-Russia investigations that are currently ongoing in Washington, D.C.
And that means Republicans were in control of the entire legislative branch in Washington, D.C. for the full course of the Clinton email investigation.
Of course, some of the investigation was done by NYPD.