https://www.latimes.com/archives/la-xpm-1999-may-18-mn-38325...
https://www.latimes.com/archives/la-xpm-1999-may-18-mn-38325...
[0] https://repository.law.umich.edu/mlr/vol104/iss3/5/ [1] https://www.law.cornell.edu/constitution-conan/amendment-14/...
"If the purpose of the requirements was to inhibit migration by needy persons into the state or to bar the entry of those who came from low-paying states to higher-paying ones in order to collect greater benefits, the Court said, the purpose was impermissible"
It's obviously hard to know for certain what SCOTUS will do, but under that standard it sounds like having health care benefits only available to long term residents would be on very shaky legal ground.
Determining residency is not rocket surgery; could steal the entire system from state income tax codes.