Dave Weldon’s long record of promoting the disproven link between vaccines and autism raises concerns among some public health experts about his ability to run the CDC.

Trump did not explicitly say in the interview that vaccines cause autism, a false claim that traces back to a retracted study from the 1990s. When pressed on the issue, Trump said his administration will complete “very serious testing,” after which “we will know for sure what's good and what's not good.”