More than a dozen Republican senators are demanding that President Donald Trump bar Agriculture Secretary Sonny Perdue from having any input into whether small refineries get exemptions from biofuel usage mandates.

The Environmental Protection Agency is lifting restrictions on summer sales of E15, checking off a top policy priority for corn growers and the biofuel industry but kicking off a new chapter as the battle likely heads to the courts.

The Environmental Protection Agency disclosed another five small refinery exemptions Thursday, adding to a climbing volume of exemptions from the federal biofuel mandate.

Biofuel credit traders would be placed under a new set of limitations under a proposed rule released today by the Environmental Protection Agency that would also allow summer E15 sales.

Ag Secretary Sonny Perdue told the House Agriculture Committee today that the Environmental Protection Agency won’t wrap up rulemaking for summertime E15 sales in time for the summer driving season. But the EPA isn’t so sure.

A new lawsuit filed Monday by the National Wildlife Federation says the Environmental Protection Agency failed to consult with federal wildlife officials before expanding biofuel production under the Renewable Fuel Standard.

The boost in required renewable fuel blending looks good on its face, but biofuel groups worry the numbers set in today’s Renewable Volume Obligations could simply be numbers on a page without a reallocation plan for gallons waived through exemptions for small refiners.