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."

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.

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.

Health Secretary Robert F. Kennedy Jr. and Defense Secretary Pete Hegseth competed in a fitness challenge of 50 pullups and 100 pushups under five minutes.

Federal health workers' pent-up frustration with Health Secretary Robert F. Kennedy Jr. is boiling over in the aftermath of an attack on the Centers for Disease Control and Prevention's Atlanta headquarters that they believe he helped stoke with inflammatory rhetoric and misinformation.

More than 750 U.S. Department of Health and Human Services staff have urged Secretary Robert F. Kennedy Jr. to guarantee federal health workers' safety after a shooting this month at CDC buildings in Atlanta,