Jindal is an anchor baby, born while his parents were here as students having every intention of returning to India (I believe) their native country. Jindal would have been a natural born citizen of India by our interpretation of law.
This would arguably preclude an anchor baby from being an NBC.
Rubio would be another anchor baby, but whose parents were Cuban refugees, with his mother early on pursuing citizenship in the US, and his father permanent resident status. I don’t recall if his mother had her citizenship before or after his birth. It would make a difference. That would make Rubio the child of two denizens or 1 citizen and 1 denizen, depending on the date of her citizenship.
This assertion is borne of a misunderstanding of American citizenship law.
It is this: American citizenship law does not now, and has never, recognized another country's citizenship law.
If a person is a U.S. citizen at birth, he is a U.S. citizen. Period. That he might also be a candidate for, say, Indian citizenship is of no moment.
At some future point, under the laws of India, he may opt for Indian citizenship. But, at that point, he loses his U.S. citizenship.
If you are a U.S. citizen at birth, you are a U.S. citizen -- regardless of how many other nationalities and citizenships you might be eligible for.
The case with Jindal parents returning to India is irrelevant according to the Elg (307 US 325) Supreme court case.
Jindal's parents are both naturalized citizens. His mother, pregnant with Bobby, was accepted as a graduate assistant at LSU, which offered her a month of maternity leave. His father gained them admission to the US on a P3-1 visa ("professional or highly skilled"). His mother could have gained entry on a student visa, however, then his father would not have been able to work, so they didn't take that route.
His father is now a civil engineer at URS, a large engineering firm, and his mother is Director of Information Technology at the Louisiana Department of Labor.
Therefore, Jindal, having been born in Louisiana, is natural born. As are Rubio and Nikki Haley, for the same reason, namely, having been born citizens. And of course, Cruz as well, being entitled to citizenship by birth because of his mother.