If it’s resolved in an airtight way, why didn’t Cruz get some kind—any kind—of resolution before throwing his hat into the ring? Even if he imagined it would be a nonstory in the primaries, he had to know the Dems would go haywire on it, were he to emerge the candidate for the general.
There is nowhere for Cruz to go for such a resolution, and no need for Cruz to obtain one, as the law is very specific and he and his parent(s) meet the requirements of law.
If Trump, the DNC or anyone else wants to make it a legal issue, then it is up to them to do so in court.
This is all a very stupid path for Trump to go down. It suggests he does not understand the law, or worse, does not like the reality of the law explained to him by those who do understand it.