There is no legitimate Constitutional basis WHATSOEVER for that to be the case. (There was even discussion during the Founding era about enumerating a protected Right (i.e., prohibition) against interference in that issue, as with self-defense.)...Why are we in the healthcare business anyway?
But the arguably bigger issue in the allegedly "ACA-related" obstructionism was that illegal invaders get far, FAR, more anti-constitutional subsidies (SNAP, ACA, AFDC, etc, etc, etc, etc...thanks to the Unelected Regime) than actual Americans - period.