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WATCH: White House press secretary Jen Psaki holds briefing

The U.S. will begin sharing its entire stock of AstraZeneca COVID-19 vaccines with the world once it clears federal safety reviews, the White House said Monday, with as many as 60 million doses expected to be available for export in the coming months.

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The move greatly expands on the Biden administration’s action last month to share about 4 million doses of the vaccine with Mexico and Canada. The AstraZeneca vaccine is widely in use around the world but has not yet been authorized by the U.S. Food and Drug Administration.

The White House is increasingly feeling assured about the supply of the three vaccines being administered in the U.S., particularly following the restart of the single-dose Johnson & Johnson shot over the weekend.

The U.S. has also been under mounting pressure in recent weeks to share more of its vaccine supply with the world, as countries like India experience devastating surges of the virus and others struggle to access doses needed to protect their most vulnerable populations.

Also, The White House announced Monday President Joe Biden spoke with Indian Prime Minister Narendra Modi and will be sending much needed oxygen equipment and PPE to help with the deepening coronavirus crisis.