The idea that Ilhan Omar could — even as a matter of mass-dunderhead rhetoric — be treated as a non-citizen because the president and his admirers do not like her politics (which are quite unlikeable) does violence to the idea of citizenship per se. In that much, it is fundamentally and literally un-American.
It is not the worst act of violence committed against the concept of citizenship in recent years: That particular distinction belongs to Barack Obama, who unilaterally arrogated to himself (and his successors!) the power to order the extrajudicial killing of American citizens in conditions that, once the legalistic mumbo-jumbo is penetrated, amount to “whenever and wherever the president damned well feels like it.” In principle and as a matter of citizenship, there is no meaningful difference between Barack Obama’s ordering the assassination of Anwar al-Awlaki — “the Osama bin Laden of Facebook,” they called him — and Donald Trump’s (hypothetically) ordering the assassination of a political critic in Reno. The pretext of “national security” will cover a multitude of sins.
Ilhan Omar became a U.S. citizen when she was a teenager. (As Jake Tapper wryly points out, she has been a citizen longer than the president’s wife has.) Maybe it was a mistake to let her into the club — I am open to the argument that we should be far choosier about whom we offer the honor and dignity of American citizenship. I might even ask some pointed political questions: Are you a Communist? Are you a Jew-hating weirdo? But we didn’t do that. Ilhan Omar is a citizen and must be dealt with as one.