The Constitution, of course

"The Constitution, of course, grants Congress no express power to
strip people of their citizenship, whether, in the exercise of the
implied power to regulate foreign affairs or in the exercise of any
specifically granted power." - Afroyim v. Rusk, 387 U.S. 253 (1967).

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AI Overview

Afroyim v. Rusk (1967) is a landmark Supreme Court case that
established that the U.S. government cannot revoke a citizen's
citizenship without their consent. The case involved Beys Afroyim, a
naturalized U.S. citizen who voted in an Israeli election and
subsequently had his passport revoked. The Supreme Court ruled that
the Fourteenth Amendment protects a citizen's right to retain
citizenship unless they voluntarily relinquish it.