This is barely even a half truth. They get the same emergency care you're entitled to. Some states, but not all, provide them with perinatal care. That's it.
https://bipartisanpolicy.org/blog/how-do-undocumented-immigrants-pay-federal-taxes-an-explainer/
You might have qualified for a subsidy if you were actually surviving on bologna sandwiches. If not, you could have simply chosen an off-exchange plan with less robust benefits but cheaper premiums.
The Federation for American Immigration Reform (FAIR) is a non-profit tax exempt organization in the United States that self-identifies as an organization seeking to reduce both legal and illegal immigration.[7] The group publishes position papers, organizes events, and runs campaigns in order to influence US immigration policies. The Southern Poverty Law Center classifies FAIR as a hate group with close ties to white supremacist groups.[8]
FAIR was founded in 1979 by the ophthalmologist John Tanton, former historian of labor movements and director of the Center for the Study of Democratic Institutions Otis L. Graham, Jr. and Sidney Swensrud, a former chairman of Gulf Oil and former governing board member of Planned Parenthood.[9][10][11]
The founding chairman, John Tanton, became leader of several anti-immigration groups[12] and held white supremacist beliefs while he led the organization.[13]
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Yikes. There
are many other websites out there, including truly non-partisan sites whose research suggests that both documented and undocumented immigrants pay more into public benefit programs than they take out.
https://immigrationforum.org/article/fact-sheet-immigrants-and-public-benefits/
https://itep.org/immigration/