Robert F. Kennedy Jr. was a key figure in protests over California vaccine laws. He could set U.S. health policy in the Trump administration.

Donald Trump’s administration will likely support global immunization efforts, even though his proposed secretary of health and human services has voiced skepticism about such initiatives, according to the head of an organization that helps to vaccinate more than half of the world’s children.

Kennedy has been nominated to lead the federal government's health agency—what does this mean for vaccine access in the U.S.?