I am sure illegals do dozens of things every day that could get them deported.

I also come from a place where voter fraud is real and significant. Underground organisations that bring old/disabled people to the urns to make them vote whatever they want do exist. We know about that. So whatever is happening in the US won't really surprise me. (Not to say something like this happens in the US, but it's perfectly possible, and it is foolish to simply outright deny that possibility)