Senate Democrats are escalating their efforts to oust Environmental Protection Agency (EPA) head Scott Pruitt with a formal resolution calling on him to resign or be fired.

Democrats said Wednesday that between his aggressive deregulatory agenda and numerous scandals of recent weeks, Pruitt has no place at the EPA.

The senators plan to introduce in the coming days a “sense of the Senate” resolution calling for Pruitt to be removed.

“I believe it is time for his imperial tenure to end,” Sen. Tom Udall(N.M.), top Democrat on the Appropriations Committee subpanel overseeing the EPA’s budget, told reporters Wednesday on Capitol Hill.

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