§ 1481. Loss of nationality by native-born or naturalized citizen; voluntary action; burden of proof; presumptions
(b) Whenever the loss of United States nationality is put in issue in any action or proceeding commenced on or after September 26, 1961 under, or by virtue of, the provisions of this chapter or any other Act, the burden shall be upon the person or party claiming that such loss occurred, to establish such claim by a preponderance of the evidence. Any person who commits or performs, or who has committed or performed, any act of expatriation under the provisions of this chapter or any other Act shall be presumed to have done so voluntarily, but such presumption may be rebutted upon a showing, by a preponderance of the evidence, that the act or acts committed or performed were not done voluntarily.
Art. 1 § 9.
No title of nobility shall be granted by the United States : and no person holding 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.
So its against the law but even Rudy Guilliano, former Mayor of New York City was knighted by Queen Elizabeth of England and should not be qualified to hold any public office. The only reason a person is supposed to be knighted is for service rendered to the queen.
Who else in public office has been knighted? Allen Greenspan.
Colin Powell was twice awarded the U.S. Medal of Freedom--by President George Bush in 1991 and President Bill Clinton in 1995--and was knighted by Queen Elizabeth in 1993.
George H. W. Bush. The title awarded by the queen can be inherited and passed down to a child. That means George W. Bush has a knighthood in the bag also.