The purpose of the Preserving Social Security and Medicare for Citizens Act of 2026 is to modify eligibility for Social Security and Medicare benefits. The main objectives are to ensure that these benefits are limited to certain individuals, specifically U.S. citizens and lawful permanent residents, and to adjust tax provisions related to these programs. Key provisions of the legislation include changes to Medicare eligibility. The bill amends existing laws to restrict access to Medicare benefits, allowing only individuals who meet specific criteria to qualify.