Schwarzenegger: Pruitt is the worst EPA head 'we have ever had'
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In another jab to President TrumpDonald John TrumpTrump: I hope voters pay attention to Dem tactics amid Kavanaugh fight South Korea leader: North Korea agrees to take steps toward denuclearization Graham calls handling of Kavanaugh allegations 'a drive-by shooting' MORE's Environmental Protection Agency (EPA) head, actor and former California Gov. Arnold Schwarzenegger (R) labeled Scott PruittEdward (Scott) Scott PruittOvernight Energy: Trump rolls back methane pollution rule | EPA watchdog to step down | China puts tariffs on US gas EPA inspector general to resign Overnight Energy: EPA watchdog says agency failed to properly monitor asbestos at schools| Watchdog won’t investigate former Superfund head’s qualifications| Florence causes toxic coal ash spill in North Carolina MORE the worst EPA administrator of all time.

"I pay no attention to what he says. He cannot be taken seriously," Schwarzenegger said at the R20 Austrian World Summit, an annual climate conference he hosts in his home country. "He's the worst Environmental secretary that we have ever had."

Schwarzenegger went on to criticize Pruitt for his ties to oil and gas companies.

“He's doing the bidding for the oil companies and the coal companies," the 70-year-old Republican told Vice News at the summit. 

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Schwarzenegger, an environmental activist, is leading an effort to sue oil companies for "knowingly killing people" through the burning of fossil fuels.

The former governor has taken jabs at Pruitt before, calling him the "wrong person" for the job months earlier, and taking to social media to criticize his policies.

In his address, Schwarzenegger urged Trump to join him and other activists in fighting climate change, despite efforts by the Trump administration to bolster the fossil fuel industry and its withdrawal from the Paris climate accord.

Pruitt has rolled back a number of the Obama administration's environmental policies, facing scrutiny from environmental advocates. 

In the latest challenge to Pruitt's rollbacks, California is leading a coalition of states in suing the agency over its removal of fuel efficiency standards goals for automakers.

Pruitt also faces a number of investigations from ethics officials over reported extensive travels on taxpayer dollars, which have led numerous lawmakers to call for his resignation.