HIRONO: So if the Attorney General or senior officials at the Department of Justice opposes a specific investigation, can they halt that FBI investigation?

COMEY: In theory yes.

HIRONO: Has it happened?

COMEY: Not in my experience. Because it would be a big deal to tell the FBI to stop doing something that -- without an appropriate purpose. I mean where oftentimes they give us opinions that we don't see a case there and so you ought to stop investing resources in it. But I'm talking about a situation where we were told to stop something for a political reason, that would be a very big deal. It's not happened in my experience. (Emphasis Added)