There is the possibility that the FBI would reopen this case to find “evidence” that supports their earlier position. CYA.
If I were a true cynic, I would even go so far as to think that the FBI will offer more immunity deals that will make it harder to impeach a President Clinton.
I'm not a
true cynic -- my optimistic side always seems to get the better of me. But I am a bit cynical about Comey's motives.
Nevertheless, the mere fact of the letter is huge, and damaging to the Clinton campaign. Comey wouldn't have written it unless the contents of Wiener's unit had serious implications for the server-gate investigation. It has to mean there are national security implications. And I think it means that any immunity deals for Huma are null and void. Huma, at least, is going down.
Anyway, if CYA was the main intent, it didn't work. This story has has already spiraled
waaaayyyyy beyond their control.