I think Comey’s involvement with the Clintons goes earlier; I think he had some involvement dating back even to the Whitewater days. Maybe someone else will remember the details.
DOJ U.S. Attorney for the Eastern District of Virginia James Comey ruling on Bill Clinton pardon action per Marc Rich?
http://undergroundreporter.org/not-conspiracy-fbis-comey-covered-clintons-decades/
Per Wikipedia: In 1996, Comey acted as deputy special counsel to the Senate Whitewater Committee