Senate Democrats slammed President Trump’s pick to be the nation’s top chemical regulator at a Wednesday hearing, painting him as a hired gun for the industries he would regulate.

Michael Dourson, tapped to lead the Environmental Protection Agency’s (EPA) chemical safety and pollution prevention office, has worked for the last two decades to conduct chemical risk research on behalf of clients including industry groups, companies and governments.

Democrats in the Senate Environment and Public Works Committee repeatedly brought up instances when Dourson’s organization, Toxicology Excellence for Risk Assessment, made far more industry-friendly findings on chemical exposure risks than the EPA, individual states or other authorities.

“Never in the history of the EPA has a nominee to lead the chemical safety office had such deep ties to industry,” said Sen. Tom Carper (Del.), the panel’s top Democrat.