Interior Secretary Ryan Zinke responded to Rep. Raúl M. Grijalva’s (D-AZ) op-ed calling for him to resign by accusing the congressman of living at the “bottom of the bottle.”

Grijalva’s office did not immediately respond to TPM’s request for comment.

Grijalva, currently ranking member of the House Natural Resources Committee, wrote an op-ed published in USA Today Friday calling on Zinke to resign for his many ethical missteps, resulting in 17 investigations. Grijalva also promised heightened scrutiny of this behavior, should he become chairman of the committee when Democrats take control of the House in January.

The congressman took issue too with Zinke’s policy leadership, accusing him of “dumbing down” science to retain President Donald Trump’s loyalty.

Zinke’s scorching rebuttal dates back to last November, when Grijalva paid a staffer a severance package worth $48,395 when she threatened to sue the congressman over his alleged drinking at work and creating a hostile work environment. Grijalva has denied the claims.