Typical CIA/DS get various people to tell half true stories, so that the real story can simply be dismissed by pointing to the untrue parts.
Dennis Montgomery had some sort of interaction going on with Arpaio, and I think it was decided eventually that he was playing them. Bill Binney when asked did not vouch for Montgomery, but said merely that his claims should be investigated. That was way before this election.
Montgomery did work for the CIA for a while. I don’t trust him, but I also don’t know how much of what he says is true and how much is just a bunch of lies.
Where is Art Bell when we need him?