Pruitt has been a very outspoken critic of President Obama's EPA, has sued the agency on mulitple occassions and has also questioned "the degree and extent of global warming and its connection to the actions of mankind,"having called the "debate … far from settled."

According to the Environmental Defense Fund, Pruitt previously boasted that he "led the charge with repeated notices and subsequent lawsuits against the U.S. Environmental Protection Agency for their [sic] leadership's activist agenda."  Moreover, per Reuters, Pruitt led the charge for Oklahoma in restoring environmental regulatory oversight to the states and away for the agency he's slated to run.  

Pruitt was elected Oklahoma's attorney general in November 2010 and has focused on restoring more regulatory oversight to states and limiting federal regulations.

As his state's top legal official, he sued the agency is he poised to lead multiple times, including a pending lawsuit to topple the EPA's Clean Power Plan, the centerpiece of Democratic President Barack Obama's climate change strategy.