The Congressional Research Service (CRS), known as Congress’s think tank, is a public policy research arm of the United States Congress. As a legislative branch agency within the Library of Congress, CRS works primarily and directly for Members of Congress, their Committees and staff on a confidential, nonpartisan basis.
The Constitution does not define the phrase natural-born citizen, and various opinions have been offered over time regarding its precise meaning.
A 2011 Congressional Research Service report stated:
The weight of legal and historical authority indicates that the term “natural born” citizen would mean a person who is entitled to U.S. citizenship “by birth” or “at birth”, either by being born “in” the United States and under its jurisdiction, even those born to alien parents; by being born abroad to U.S. citizen-parents; or by being born in other situations meeting legal requirements for U.S. citizenship “at birth”. Such term, however, would not include a person who was not a U.S. citizen by birth or at birth, and who was thus born an “alien” required to go through the legal process of “naturalization” to become a U.S. citizen.
He is a Canadian Eh!