The President and the AG could ORDER the FBI to turn the information over to them or to others.
The FBI is NOT a government, unto itself, answerable to no one.
I believe the Congress SHOULD BE able to obtain this information.
If fake information was knowingly used by partisan political operatives, to disrupt the elected opposition, I believe it is a crime.
In Watergate several such figures, served prison time. (no, the crimes are not identical, but the intended result is quite the same)