President-elect Trump's nomination of Robert F. Kennedy Jr. to lead the Department of Health and Human Services has raised a number of questions in the public health community about Kennedy's long history of opposing vaccines. It's also put a spotlight on a number of other comments he's made, including about what millions of Americans eat and drink each day. William Brangham reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders