From the CIP regulations:
(4) Identification number, which shall be:
(i) For a U.S. person, a taxpayer identification number; or
(ii) For a non-U.S. person, one or more of the following: a taxpayer identification number; passport number and country of issuance; alien identification card number; or number and country of issuance of any other government-issued document evidencing nationality or residence and bearing a photograph or similar safeguard.
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