Yes I grasp it, but there is no legal forum for it. It’s up to those who would wish him declared ineligible to bring a case.
For example, you don’t have to go to court and claim/prove you were not speeding every time you drive. But if someone does day you were, then you present a defense.
Trump suggest Cruz was not a NCB, Cruz showed the mother’s birth cert and the law.
Case closed, but unfortunately, Trump’s mouth is not.
‘but there is no legal forum for it.’
IF Cruz wins the primary, you’re in for an eye opener. And it will not come from Trump.