2 U.S.C. § 441e : US Code - Section 441E: Contributions and donations by foreign nationals

    (a) Prohibition
      It shall be unlawful for - 
        (1) a foreign national, directly or indirectly, to make - 
          (A) a contribution or donation of money or other thing of
        value, or to make an express or implied promise to make a
        contribution or donation, in connection with a Federal, State,
        or local election;
          (B) a contribution or donation to a committee of a political
        party; or
          (C) an expenditure, independent expenditure, or disbursement
        for an electioneering communication (within the meaning of
        section 434(f)(3) of this title); or

        (2) a person to solicit, accept, or receive a contribution or
      donation described in subparagraph (A) or (B) of paragraph (1)
      from a foreign national.
    (b) "Foreign national" defined
      As used in this section, the term "foreign national" means - 
        (1) a foreign principal, as such term is defined by section
      611(b) of title 22, except that the term "foreign national" shall
      not include any individual who is a citizen of the United States;
      or
        (2) an individual who is not a citizen of the United States or
      a national of the United States (as defined in section
      1101(a)(22) of title 8) and who is not lawfully admitted for
      permanent residence, as defined by section 1101(a)(20) of title
      8.