Some were caught up with the crowd psychology of the moment. But those who fervently chanted “Send her back!” during President Trump’s rally on Wednesday evening should be sent back to school.

Those chanters do not understand a fundamental tenet of America, namely, our nation’s long-ago enshrined expectation that views alone are no cause for prejudice against fellow citizens. These chants are, of course, made worse by the history of who they target. Ilhan Omar was born in Somalia and attained U.S. citizenship at the age of 17. She did come from a foreign territory.