More than 750 HHS employees sent a signed letter to members of Congress and Health Secretary RFK Jr., calling on him to stop spreading misinformation.

The AAP published its own vaccine schedule in a break from federal guidance. HHS secretary RFK Jr. took to social media to respond.

Annals of Internal Medicine editor Christine Laine says she won’t retract the study, as demanded by Robert F. Kennedy Jr., and "we’re not changing what we do because of threats."

Kennedy Jr. promising to find the cause of autism by September. The secretary of Health and Human Services said he believed an environmental toxin was responsible for the dramatic increase in the condition and vowed to gather “the most credible scientists from all over the world” to solve the mystery.

The 71-year-old’s odd workout clothing choice caught the internet’s attention again this week after Kennedy posted a video with Defense Secretary Pete Hegseth.

RFK Jr. hasn't completely alienated all his famous in-laws, however. Earlier this week, Chris Pratt came to the defense of the politician, whose cousin Maria Shriver is the mother of Pratt's wife, Katherine Schwarzenegger.

U.S. Health Secretary Robert F. Kennedy Jr. has promised "a massive testing and research effort" to determine what he says are the environmental causes of autism. Under Kennedy's direction, however, the government recently ended funding for studies looking into some of those environmental factors.