That started with those Arab countries relegating Jews to being second class citizens due to accusations of dual loyalty.
That antisemitic trope has now become a dominant view in the Arab world that justifies endless antisemitism.
What Omar and others who think like her have been doing is simply trying to normalize that view here.
Ignorance is a bad excuse at this point. Those who care about fighting bigotry and preserving human dignity in America must loudly speak out.