Jindal simply isn’t eligible. A fairly strong case can be made for Rubio, but there is no case that can be made for Jindal being a natural born citizen.
His folks came to America on student visas and not as approved immigrants.
His mother was, in fact, ALREADY pregnant with him when they arrived, and he was born a few short months afterwards.
Since it takes a number of years even to receive one’s citzenship, there is no way that they could have sought out citizenship and had the residency requirement prior to his birth.
IOW, his parents were the subjects of India when they arrived, when he was born, and for some time afterwards, probably up into his elementary years.
In short, Jindal was born a citizen of India to parents who were citizens of India who were simply studying in the USA. If “natural born citizen” means this, then it is simply a useless requirement, because it can mean anything.