22 U.S.C. § 4215 : US Code - Section 4215: Notarial acts, oaths, affirmations, affidavits, and depositions; fees

      Every consular officer of the United States is required, whenever
    application is made to him therefor, within the limits of his
    consulate, to administer to or take from any person any oath,
    affirmation, affidavit, or deposition, and to perform any other
    notarial act which any notary public is required or authorized by
    law to do within the United States; and for every such notarial act
    performed he shall charge in each instance the appropriate fee
    prescribed by the President under section 4219 of this title.