Robert F. Kennedy Jr. has said vaccines are not safe. His support for abortion access has made conservatives uncomfortable. And farmers across the Midwest are nervous over his talk of banning corn syrup and pesticides from America's food supply.

Senators from both sides of the aisle are expected to carefully examine the nominee's commitment to evidence-based science and his readiness to lead HHS.

The Senate committees on health and finance will probe Robert F. Kennedy Jr. next week in his bid to be the next secretary of the Department of Health and Human Services.