Not under the facts you provide.
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Follow the link bellow for more information
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: email@example.com; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.
He was born a US citizen and at 18 went through the legal process of expatriating? I would be shocked if he did this legally. You may need to get an attorney and look into this.