President Biden is under increasing pressure to share the U.S. vaccine stockpile with the rest of the world.
The federal government has been amassing doses, growing its supply into what will likely become a surplus, as the rest of the world struggles with shortages. The U.S. has purchased enough vaccines to immunize every adult in the country three times over.
The supply is likely to grow.
This week, Biden announced he had directed the administration to purchase an additional 100 million doses from Johnson & Johnson.
The White House said the extra doses could be a backstop for possible manufacturing issues, help vaccinate children, or serve as booster doses if they become necessary to fight against variants of the virus.