The U.S. Centers for Disease Control and Prevention is planning a large study into potential connections between vaccines and autism, two sources familiar with the matter told Reuters, despite extensive scientific research that has disproven or failed to find evidence of such links.

The CDC’s decision to reinvestigate links between vaccines and autism after decades of scientific inquiry that showed no such connection is a bellwether moment in the anti-public health trajectory of Trump’s fascistic policies.

The US Department of Health and Human Services asked the US Centers for Disease Control and Prevention to study vaccines and autism, a person familiar with the situation told CNN, despite strong evidence that vaccines do not cause autism.