In a shift away from next-generation Covid-19 vaccines, the Trump administration is investing $500 million in a vaccine project championed by two scientists who were recently tapped to serve in senior roles within the National Institutes of Health,

The potential change outlined in a statement would require all new vaccines to undergo placebo testing, sparking concerns among medical experts.

HHS Secretary Robert F. Kennedy Jr. is requiring all new vaccines to undergo placebo testing in a new policy change meant to promote greater transparency.