In public, Trump was alternately incredulous and defiant. “I don’t see any reason why it should be delayed further,” he tweeted. He later hinted that he would personally block the FDA from adopting the sixty-day standard. “That has to be approved by the White House,” he said, adding, “We may or we may not approve it”—comments that further shook confidence at a time when the public was increasingly worried that Trump would rush the shots heedless of the risks.[7] Polls showed the number of Americans saying they were ready to take a vaccine had fallen from 72 percent in the spring to 51 percent
  
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