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An official such as the president does not need to take a special oath to become subject to the penalties of perjury. He took an oath, by Art. II Sec. 1 Cl. 8, to "faithfully
execute the Office of President of the United States" and to "preserve, protect and defend the Constitution of the United States" to the best of his ability. While he holds
that office, he is always under oath, and lying at any time constitutes perjury if it is not justified for national security. ( http://www.constitution.org/cmt/high_crimes.htm )
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