The election system is overwhelmed no way the FBI or FEC can get a handle on this in such a short period (before the election).
The U.S. is very close to reaching a banana republic status. ...as far as elections are concerned, at least. And without election integrity, we (literally) have nothing our Constitutional Republic is dead. That being the case, Im of the rather extreme opinion that those who knowingly commit voter fraud should get the death penalty.
Glad to meet you, fellow extremist.