It’s supposed to mean naturalized citizen of these United States, who came here from Afghanistan. How much of that is true, is anybody’s guess.
“naturalized citizen of these United States”
Pull the immigration and naturalization files....anyone named in there should be rounded up ASAP. What organization brought him here? Deport any others they brought in just to be sure. In fact, I am a fan of a half way deport i.e. take them about half way back and drop them from 20000 feet.