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

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.

RFK Jr. promised to identify the causes of autism but has eliminated parts of his agency actively investigating them and has cut millions in funding for autism research.

HHS chief RFK Jr. has spoken about his own battle with heroin addiction. His cousin Caroline says he led other family members "down the path."

The US Department of Health and Human Services said it is re-establishing the Task Force on Safer Childhood Vaccines, a panel of US health officials tasked with making recommendations on vaccine development,

Chris Pratt told Bill Maher on Monday that he hopes RFK Jr. and the Trump administration are successful and warned against being "mired in hatred" for the president.

A Department Health and Human Services spokesperson declined to verify the authenticity of the document, which was obtained by ABC News.

In a recent social media post, Robert F. Kennedy Jr. revealed he won't be running for president in 2028 because of his "loyalty" to Donald Trump.