A bill that would make it illegal for Americans to be citizens of another country is causing anxiety for millions of dual citizens living in the United States and abroad. Introduced by Sen. Bernie Moreno (R-OH) on Dec. 1, 2025, the Exclusive Citizenship Act of 2025 seeks to establish that U.S. citizens “shall owe sole and exclusive allegiance to the United States.”

If passed in its current form, something legal experts say is unlikely, the legislation will automatically strip dual citizens of their U.S. citizenship should they fail to renounce their additional citizenship within 12 months of the law’s enactment, an act with far-reaching legal and tax ramifications.