Paul Ingrassia is nothing more than a writer who is making his own interpretation of the "Natural Born Citizen" clause in the Constitution.
He ain't going anywhere..........Sheesh!
I was writing about this long before you were. See the report I wrote about Bobby Jindal and several others years ago: https://www.scribd.com/lists/22182725/Some-Politicians-Seeking-High-Office-Who-Are-Not-A-Natural-Born-Citizen-of-U-S
Click on my user ID if you want to learn more about my writings.