Where in the NDAA does it say that the POTUS can’t be detained?
Give me a quote.
Where in the NDAA does it say I can’t come over to your house and have you locked up for being insane? Would you please show me ... LOL ...
A sitting president cannot be arrested. He cannot be detained. The Department of Justice issued an opinion about this back in 1973, and reviewed that decision and updated it in 2000. The decision can be found here: http://www.justice.gov/olc/opiniondocs/op-olc-v024-p0222.pdf.
The basic finding:
“The indictment or criminal prosecution of a sitting President would unconstitutionally undermine the capacity of the executive branch to perform its constitutionally assigned functions.”
So, again, go back to the Constitution. The only way to remove a sitting President is through impeachment and conviction.
Quit pinning your hopes on a military coup.