It was going on under Obama and other presidents, with illegals as well as with US citizens. It is, after all, the law. Or, are you arguing that the President should not enforce the law?...perhaps only enforcing it when he wants to "punish his enmies" (to quote Obama)? Don't pass laws which are amenable to abuse. Repeal them when you do so by accident. Don't argue that they should selectively be enforced, unless you don't believe we are a nation of laws.
But, to the issue of separations: It is amazing that you guys are arguing that only US citizens arrested for crimes should be jailed and separated from their kids, but illegal aliens should be treated better than that.
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