He could close the borders to keep Human Transmittable Avian Flu inside. Nobody outside the US needs a new pandemic, but the raw milk drinking antivaxx folks in the US seem to love it.
The idiocy of people like RFK Jr. looking at avian flu, polio, measles, whooping cough and COVID, and deciding that vaccines are dangerous so should be banned, is quite incredible. And now he's in charge of US health policy.
During the years of the Nazi regime, German doctors argued that Jews spread disease. Reflecting common themes in Nazi propaganda, these medical professionals repeatedly pushed the false claim that Jews were responsible for outbreaks of typhus—a deadly contagious disease spread by lice.