I think the argument that they are trying to make is that Trumps lawyer was giving Trump an undocumented campaign donation. If the lawyer paid off bimbos, without compensation then he gave Trump a gift or donation.
I think Trump would have to argue that his attorney did that for him all the time. And he was paid on a retainer for which small pay-offs like that are just included as part of the deal. Larger pay-offs may require Trump to OK the amount or even pay for it.
The sad thing is this is just another example of laws being enforced against republicans that are never enforced against democrats. Like the former Virginia governor who was convicted of talking to a lobbyist. Something ever politician does but which is never considered a crime unless an out of favor republican does it.
That's yet another new "legal" theory cooked up by activist Democrats. Lots of people do lots of things to assist candidates and causes they prefer. Under the theory than anything somebody does to help an individual is a campaign contribution, then not going to protest at a Hillary campaign event is obviously a donation to her.
So collectively, the people on FR gave Hillary a tremendous campaign "donation" by not showing up at all of her events with signs. Time to get the Special Counsel to look in to that!