This bill aims to prohibit the admission of aliens from countries where the United States cannot reliably verify their identities or backgrounds. It explicitly builds upon the framework established by Presidential Proclamation 9645 and upheld by the Supreme Court in Trump v. Hawaii . The legislation defines "designated countries" to include those previously identified in Proclamation 9645, such as Iran, Libya, North Korea, Somalia, Syria, Venezuela, and Yemen. Additionally, it allows the Secretary of State to designate other countries, like Afghanistan, Sudan, Eritrea, and the Central African Republic, if they lack adequate information sharing or pose national security risks. The bill mandates the Secretary of Homeland Security to prohibit the admission of any alien who is a national of or has resided in a designated country within the preceding five years. However, it provides specific exceptions for lawful permanent residents , pre-enactment refugees or asylum grantees, U.S. Armed Forces members and their immediate families, and diplomatic visa holders. Admission may also be granted on a case-by-case basis for those deemed in the national interest, subject to enhanced screening. The Secretary of Homeland Security retains authority to waive the prohibition for humanitarian reasons or to meet international obligations, consistent with prior legal precedents. The legislation establishes a process for initial country designations, annual review, and congressional oversight, and requires enhanced vetting procedures for those qualifying for exceptions or waivers. Violations of the act would lead to removal proceedings and a 10-year bar from re-entry.