The NBC thing might be OK with the courts, but imagine if you will...
A Hillary ad comes on in October. The screen showing the birthplace of several former Presidents.. At the end, they show a picture of a checkpoint on the Canadian border and a very concerned voice tells us “For the first time in US history, we might have to have a passport to visit a Presidents birthplace”
Nothing untrue about it, regardless of eligibility.
No matter who the GOP nominee is, the Democrats and their media allies are going to misprepresent the truth. Trump is a target rich environment.
Except you don't need a visa to visit Canada do you?