US President Donald Trump arrives for the Operation Warp Speed Vaccine Summit in the Eisenhower Executive Office Building adjacent to the White House in Washington, DC on December 8, 2020. - 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. (Photo by SAUL LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images)
