It’s pretty basic.
Social leeches and those who violate our laws aren’t helping build anything.
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You want to know why America's health system was collapsing with high costs? Because illegals were using the Emergency rooms for their health care. When Reagan passed the law stating emergency rooms could not turn people away if they could not pay - it was done under the assumption most Americans were here legally and had some sort of ability to pay over time or some health insurance.
This burden allowed the opening for Obamacare fiasco. Illegal immigration places is a head tax on all Americans.