Once again, there's no there there.
They want to make something out of what is nothing.
Let me ask all the screaming heads.
The company you work for, does that make you guilty? That someone donated to a charity of yours and also exchanges e-mail with you via your work for work purposes (contacts, services, etc), does that make you guilty?
No. It does not. This happens millions of times all over the world to *regular* people. If you are doing it, how are you going to talk about Clinton? Please.
It's also way less "unethical" than say raising the rents on your properties that your campaign is using and using campaign cash to pay those rents.
Especially considering there's little logical reason to do so. Trump is not spending much money on expanding staff, ergo, why would they pay more to rent the facilities? Because he's a greedy douche who is clearly unethical and abusing the shit out of money donated to his campaign. He's robbing his donors.