22 C.F.R. § 40.2 Documentation of nationals.
Title 22 - Foreign Relations
(a) Nationals of the United States. A national of the United States shall not be issued a visa or other documentation as an alien for entry into the United States. (b) Former Nationals of the United States. A former national of the United States who seeks to enter the United States must comply with the documentary requirements applicable to aliens under the INA.
Title 22: Foreign Relations
PART 40—REGULATIONS PERTAINING TO BOTH NONIMMIGRANTS AND IMMIGRANTS UNDER THE IMMIGRATION AND NATIONALITY ACT, AS AMENDED
Subpart A—General Provisions
§ 40.2 Documentation of nationals.