“We think we found an answer to autism,” Trump said, promising what he called “one of the biggest announcements medically, I think, in the history of this country” to be revealed the following day. Get the answer to autism. Trump pledged that the announcement would be made on Monday and would be “very important” for millions of parents. UNDER SCRUTINYThe remarks also underscored the central role of Trump’s Health and Human Services Secretary, Robert F. Kennedy Jr., a longtime vaccine safety critic. Additionally, Kennedy has declined to say outright that vaccines do not cause autism, prompting both criticism and praise among experts and commentators.