This is part of the crossover from business to politics, I think, and I believe it is a net plus for the country. Politics has descended into the gutter long ago, where misleading or lying ads (which are different animals) have been an accepted tactic, where the 'victim' tries to counter the ads solely with factual refutation, and never with appropriate legal remedy.
Think what such a warning might accomplish once the dems are staging the attacks - they do not fear shame, but they DO fear monetary loss, as well as power loss.
The one warning note in my brain on this is that Trump may signal having a thin skin - although having a thin skin about lies is much less a sin than being thin skinned about the truth (like the dems).
The problem with our side is that we have so many people with thick skin, that they get weighed down by it and become sitting targets.
Warn them off from pulling a stunt and they will think twice before doing it. Threaten to come after them in a way that will hurt their bottom line, and not to just score a political point, and they will know that this is not a game anymore.
You really think the country needs litigation between candidates injected into our politics?
Trump can’t seriously be worried about Kasich as a rival, although Kasich still seems to consider himself one.
I think this is fair warning. Kasich shouldn’t be allowed to take Trump down by libel.