Article I, Section 9, Clause 8:
Seems pretty clear to me.No Title of Nobility shall be granted by the United States: And no Person any Office of Profit or Trust under them, shall, without the Consent of the Congress, accept of any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince, or foreign State.
-edit- As long as he doesn't use the title I think he's okay.
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