“You must have misunderstood the wording of the question as it was asked.”
Impeachment “post facto” isn’t a Bill of Attainder.
It isn’t ex post facto if the impeachment charges an act that was illegal when committed.
Ex post facto is why we have “grandfather clauses” - if ownership of warthogs is outlawed on friday, you can’t be imprisoned for owning a warthog on thursday.
Your thursday hog is “grandfathered”.
The stretch here is that the democrats will probably claim that a post office impeachment is merely a continuation of an impeachment begun in office.
The question, as asked was:
“Can you impeach a private citizen?”
I answered: “No.”
You can go on-and-on about this if you want to,
but I have better things to do.