ROUGH CUT (NO REPORTER NARRATION) Senator Bernie Sanders grilled President Trump's EPA pick Andrew Wheeler at his confirmation hearing asking whether he believed in climate change.

He along with other Democratic lawmakers on Wednesday slammed U.S. President Donald Trump's new pick to run the Environmental Protection Agency as a pro-business extremist, but harbored little hope of blocking his confirmation in the Republican-controlled Senate.

Trump nominated EPA Acting Administrator Andrew Wheeler to run the agency permanently last week.

If confirmed, Wheeler would continue to push the Trump administration's deregulatory and pro-fossil fuels agenda without the constant criticism over alleged mismanagement that plagued Wheeler's predecessor Scott Pruitt.

A Washington insider with years of experience as a top aide to Republican Senator Jim Inhofe, a climate change doubter, Wheeler has been running the EPA since July, when Pruitt resigned in a flurry of criticism over his travel expenses and use of resources and staff for personal matters.

"Mr. Wheeler is certainly not the ethically-bereft embarrassment that Scott Pruitt proved to be," Senator Tom Carper, the top Democrat on the Senate Environment and Public Works Committee, said in opening remarks at Wheeler's confirmation hearing.

Carper, however, added: "Mr Wheeler's environmental policies appear to be just as extreme as his predecessor's." Wheeler's opening remarks, which were briefly interrupted by shouting protesters, focused on what he called his work to reduce the regulatory burden on business while also protecting air and water quality for Americans.

Democrats have said they would press Wheeler during his confirmation hearing on his past lobbying, which includes work for underground coal giant Murray Energy - a vocal proponent of reduced environmental and safety regulation.

They are also likely to continue to needle Wheeler about his record so far at EPA, which has largely been a continuation of Pruitt's moves to undo or weaken the Obama administration's environmental regulations - including on power plant pollutant emissions.

Industry representatives and Republican lawmakers, however, have largely praised Wheeler for his deregulatory stance, arguing the EPA has for years hurt growth by imposing overly-burdensome requirements on businesses.