Core Viewpoint - Senator Bernie Moreno has proposed a new bill aimed at prohibiting U.S. citizens from holding dual citizenship, requiring those with dual nationality to renounce their foreign citizenship or risk losing their U.S. citizenship [1][2]. Legislative Proposal - The proposal, titled the "2025 Exclusive Citizenship Act," is considered one of the most radical redefinitions of U.S. citizenship in decades, mandating that dual citizens must relinquish their non-U.S. citizenship within one year of the law's enactment or be deemed to have voluntarily forfeited their U.S. citizenship [1][3]. - The bill is currently under review by the Senate committee, and it remains uncertain whether Republican members will advance the proposal [2]. Current Legal Context - U.S. law has historically allowed dual citizenship, as established by Supreme Court rulings such as the Afroyim v. Rusk case, which asserts that U.S. citizens do not lose their citizenship unless they voluntarily renounce it [3]. - It is estimated that tens of millions of U.S. citizens qualify for dual citizenship, including many individuals from Mexican and other immigrant backgrounds [3]. Implementation Challenges - The proposal requires the U.S. Department of State and the Department of Homeland Security to create a database and establish rules to track and enforce changes to citizenship laws [3]. - Within 180 days of the law's enactment, the Secretary of State must issue regulations related to the declaration, verification, and record-keeping of citizenship [4]. Legal and Technical Concerns - Legal experts indicate that any law mandating U.S. citizens to renounce foreign citizenship may face rigorous legal scrutiny [5]. - There are significant technical challenges, as many individuals may be unable to comply with the requirement to renounce foreign citizenship due to laws in their countries of origin that do not permit renunciation [5].