NEW YORK (AP) — Health Secretary Robert F. Kennedy Jr. personally directed the U.S. Centers for Disease Control and Prevention to update its website to contradict its longtime guidance that vaccines don’t cause autism, he told The New York Times in an interview published Friday.

His comments provide clarity into who directed the CDC’s website change, after many current and former staffers at the agency were surprised to see new published guidance on Wednesday that defies scientific consensus. Kennedy, a longtime vaccine critic, has upended the public health agencies he oversees and pushed for and enacted changes that have unsettled much of the medical community, which sees his policies as harmful for Americans.

“The whole thing about ‘vaccines have been tested and there’s been this determination made,’ is just a lie,” Kennedy said in the interview, which was conducted Thursday.

The CDC’s “vaccine safety” page now claims that the statement “vaccines do not cause autism” is not based on evidence because it doesn’t rule out the possibility that infant vaccines are linked to the disorder. The page also has been updated to suggest that health officials have ignored studies showing a potential link.