Illinois Democrat Tammy Duckworth asked the Environmental Protection Agency’s inspector general Thursday to investigate whether the agency broke the law in granting dozens of waivers to the oil industry to not blend corn ethanol into the gasoline supply.

Duckworth said new documents show that EPA has deceived members of Congress about its reasons for granting 35 small refinery exemptions in the last two years, compared to the seven granted under the Obama administration.

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