What's behind rising autism rates: A broader definition of autism and better screening

President-elect Donald Trump seemed to entertain the discredited theory that vaccines cause autism as he answered questions from journalists at a press conference Monday at his Mar-a-Lago club.

Trump said Robert F. Kennedy Jr., his choice to lead the Department of Health and Human Services who has been an anti-vaccine advocate, would look into the reasons for rising autism rates.

Trump, seeming to respond to Senate Republican leader Mitch McConnell's defense of the polio vaccine, called himself “a big believer in it.”

“You’re not going to lose the polio vaccine,” Trump said.