U.S. President Donald Trump speaks in the Oval Office at the White House in Washington, U.S., December 7, 2020. REUTERS
US President Donald Trump on Tuesday signed an executive order "to ensure that American citizens have first priority to receive American vaccines."
It is unclear how the order would be enforced, as vaccine makers have already inked in deals with other countries.
But it suggests the US is concerned about potential shortages as it seeks to immunize tens of millions of people in the coming months.
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