would make it harder for legal immigrants to become citizens or get green cards if they have ever used a range of popular public welfare programs, including Obamacare,
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Good, immigrants should not be a burden on the citizens, they should be an asset to the country as a whole.
Well, yeah. That's the supposed reason for inviting them here. We are endlessly told they are so much more industrious and harder working than the natives.
I say we even go a step further and do what they do in Japan: require that employers pay them AT LEAST a 10% wage premium over the going rate for people with similar positions. Then, be responsible for their repatriation once it is decided that they are no longer worth said premium.