RFK Jr. was the great hope for autism families. Now, they're not so sure.

Chip Somodevilla/Getty Images; Alyssa Powell/BI

As a prominent vaccine skeptic, Kim Mack Rosenberg was elated when Robert F. Kennedy Jr. took the reins at the Department of Health and Human Services. She's been a key player in RFK's movement to Make America Healthy Again, serving as the general counsel for Children's Health Defense, the nonprofit he founded in 2015.

But as the mother of an adult son with autism, Mack Rosenberg has been alarmed by the Trump administration's moves to...