The House Energy and Commerce Committee has launched an investigation into petroleum companies’ involvement in a Trump administration rollback of Obama-era fuel economy standards for vehicles.

In letters to Marathon Petroleum and the American Fuel and Petrochemicals Manufacturers (AFPM), Democrats accused the two of involvement in a "covert lobbying and social media campaign" to support the rollback, which was announced in August 2018.

A key pillar of former President Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE's environmental legacy involved strengthening fuel emissions standards for cars to 54.5 miles per gallon by 2026. But Trump's rollback, which Environmental Protection Agency (EPA) analysis said would increase petroleum consumption by 500,000 barrels per day, would freeze the average fuel economy at 37 miles per gallon.

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The

New York Times

found the two groups worked through other conservative and energy groups to push favorable reception of the rollbacks on fuel standards.

Democrats have asked the two entities to turn over all communications with government officials about the policy change, as well as descriptions of any conversations or lobbying efforts they were involved in.

They made the same request to conservative groups the American Legislative Exchange Council and Americans for Prosperity, and Energy4US, a group tied to AFPM.

The auto industry has opposed the rollback of fuel efficiency standards, largely on the grounds that California is fighting to keep its more stringent standards, and EPA career staff countered claims from agency heads that the measure would save lives.

That left House Democrats to eye other industries that might benefit from the change.

“The oil industry thus stands to profit significantly from the proposed rollback,” Democrats wrote in the letter, which was signed by committee leaders Reps. Frank Pallone (NJ), Jan Schakowsky Janice (Jan) Danoff SchakowskyAhead of a coronavirus vaccine, Mexico's drug pricing to have far-reaching impacts on Americans With Biden, advocates sense momentum for lifting abortion funding ban Hillicon Valley: Facebook removed over 22 million posts for hate speech in second quarter | Republicans introduce bill to defend universities against hackers targeting COVID-19 research | Facebook's Sandberg backs Harris as VP pick MORE (Ill.) and Paul Tonko Paul David TonkoClark rolls out endorsements in assistant Speaker race OVERNIGHT ENERGY: Supreme Court upholds permit for B pipeline under Appalachian Trail | Report finds NOAA 'Sharpiegate' statement 'not based on science' but political influence | EPA faces suit over plan to release genetically engineered mosquito Report finds NOAA 'sharpiegate' statement 'not based on science' but political influence MORE (N.Y).

Marathon Petroleum did not immediately respond to request for comment.

AFPM said they received the letter and planned to respond. They also noted their previous public comments in support of the rule.

"We support the Administration’s efforts to ensure fuel economy standards are technologically feasible and appropriately balance increased efficiency with consumer choice, affordability, and safety," AFPM president and CEO Chet Thompson said in a statement to The Hill. "The existing fuel economy standards have not been met for several years and, therefore – as intended in the original rule – are in need of adjustment.”



The request comes as Democrats are gearing up for a Thursday hearing on the rollbacks, which will include Bill Wehrum, the head of the EPA Office of Air and Radiation, and Mary Nichols, head of the California Air Resources Board who has threatened strict pollution measures in response to the rollback.