President Joe Biden will require essential, nonresident travelers crossing U.S. land borders, such as truck drivers, government and emergency response officials, to be fully vaccinated beginning on Jan. 22, the administration planned to announce Tuesday. The Associated Press reports: A senior administration official said the requirement, which the White House previewed in October, brings the rules for essential travelers in line with those that took effect earlier this month for leisure travelers, when the U.S. reopened its borders to fully vaccinated individuals. Essential travelers entering by ferry will also be required to be fully vaccinated by the same date, the official said. The rules pertain to non-U.S. nationals. American citizens and permanent residents may still enter the U.S. regardless of their vaccination status, but face additional testing hurdles because officials believe they more easily contract and spread COVID-19 and in order to encourage them to get a shot. […] About 47 million adults in the U.S. remain unvaccinated, according to figures from the Centers for Disease Control and Prevention.