The fix was in before the investigation started. Let’s recall that someone chose to start the investigation into Hillary’s email server without a grand jury ... hence no subpoena powers.
Surely it was. But (at least according to Klein) it was Lynch's decision, not Comey's to do that. Impaneling a GJ could have happened after some of the inquiries were made by the FBI. Like any other LEO, the FBI can gather evidence without subpoenas.
Slick Willy/Loretta Lynch at the tarmac in Phoenix did it !!!