U.S. national U.S. citizen or U.S. national « Immigration Terms and Definitions Involving Aliens » IRS (Internal Revenue Service) "Immigration Terms and Definitions Involving Aliens" undocumented alien U.S. citizen US Citizen vs US National anyone who has illegally entered this country deportation IRS defines an American national a enter the country illegally without proper authorization « Immigration Terms and Definitions Involving Aliens » IRS defines U.S. “nationals” are clearly “individuals” "Immigration Terms and Definitions Involving Aliens" defines aliens Immigration Terms and Definitions Involving Aliens citizenship status: U.S. citizen