Anybody who is a “sovereign citizen” has to explain what he is a citizen of. Himself? that makes no sense.
Is he saying that he is not an American citizen? If so, then he should leave and go to North Korea.
No, they are American Citizens, they're just not citizens of the United States. They're what the Founders knew as State Citizens, and they are under the jurisdiction of their respective, Sovereign State, not the feral federal government.
Thus the term Sovereign Citizen.
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Here are quotes from a few relatively recent court cases.
“There is a difference between privileges and immunities belonging to the citizens of the United States as such, and those belonging to the citizens of each state as such”.
Ruhstrat v. People, 57 N.E. 41 (1900)
“The rights and privileges, and immunities which the fourteenth constitutional amendment and Rev. St. section 1979 [U.S. Comp. St. 1901, p. 1262], for its enforcement, were designated to protect, are such as belonging to citizens of the United States as such, and not as citizens of a state”.
Wadleigh v. Newhall 136 F. 941 (1905)
“There are, then, under our republican form of government, two classes of citizens, one of the United States and one of the state”.
Gardina v. Board of Registrars of Jefferson County, 160 Ala. 155; 48 So. 788 (1909)
“That there is a citizenship of the United States and citizenship of a state,...”
Tashiro v. Jordan, 201 Cal. 236 (1927)
Quoting Cruikshank
“The governments of the United States and of each state of the several states are distinct from one another. The rights of a citizen under one may be quite different from those which he has under the other”.
Colgate v. Harvey , 296 U.S. 404; 56 S.Ct. 252 (1935)
“ …as distinct from the fundamental or natural rights inherent in state citizenship”.
Madden v. Kentucky , 309 U.S. 83: 84 L.Ed. 590 (1940)