Obama is criticizing the anti-immigrant sentiment in this country as "un-American."
Fox news feigning outrage over the fact that new citizen Emily Blunt doesn't like the GOP candidates, is accusing her of being "un-American."
Emily Blunt and the xenophobes (which, by the way, would make a great band name) are probably wondering, "Well how could I be American then?" It's pretty simple.
From right to left on the political spectrum, there is nothing more American than calling someone else un-American. Blunt and the xenophobes just have to choose a group to accuse.