They should be saying “of Pakistani origin,” meaning that he was orginally from Pakistan, although he’s now a US citizen.
This is just the type of fine, upstanding Muslim citizen Obama wants more of, btw; one of the objectives of any “overhaul” of immigration under Bambi is the legal admission of more Africans, Middle Easterners and Southeast Asians from Muslim countries. He said this openly a couple of years ago.