One of the most common arguments against the idea that the Constitution mandates birthright citizenship, even for the children of illegal immigrants, is that the relevant provision of the 14th Amendment was written to protect “the BABIES OF SLAVES” (to quote President Trump).

That was a principal purpose of the provision. But that doesn’t mean the provision doesn’t cover other children, too, as I wrote in a column about the issue a few months ago:

The meaning of a law is, in the first........

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