text written by a source other than an officer (as defined in section 2104 of title 5, United States Code) or employee (as defined in section 2105 of title 5, United States Code) of the agency: (1) The term alien , when used to refer to an individual who is not a citizen or national of the United States. (2) The term illegal alien when used to refer to an individual who is unlawfully present in the United States or who lacks a lawful immigration status in the United States. (c) Uniform definition (1) In general Chapter 1 of title 1, United States Code, is amended by adding at the end the following: 9. Definition of foreign national In determining the meaning of any Act of Congress, or of any ruling, regulation, or interpretation of various administrative bureaus and agencies of the United States, the term foreign national means any individual other than an individual— (1) who is a citizen of the United States