This bill nullifies a requirement for certain foreign travelers to show proof of being fully vaccinated against COVID-19 before being admitted into the United States. Specifically, this bill nullifies a U.S. Customs and Border Protection (CBP) rule that imposed this requirement for each traveler who is neither a U.S. national nor a lawful permanent resident arriving at land port of entry or ferry on the U.S.-Canada border. The bill also nullifies another CBP rule that applied this restriction to the U.S.-Mexico border. The bill also nullifies any subsequent decision by CBP or the Department of Homeland Security that imposes such a requirement.