This is a gross violation of some of our most sacred principles.
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Historically visas could and were denied for completely arbitrary reasons.
The right to free speech. Even in its restrictive First Amendment form.
But the First Amendment does apply to the many US citizens and permanent residents who are being indirectly surveilled, profiled, and chilled in their speech as a result of the extra scrutiny of the foreign visa applicants with whom they interact and connect on social media.