The source, who requested anonymity, said the group was told the executive order could include a long-awaited waiver that would allow E15 gasoline to be sold more easily during summertime months, a review of how the Environmental Protection Agency estimates emissions impacts of biofuels, and support for a congressional tax credit for domestic producers of biodiesel.

A White House official did not respond to a request for comment.

(Reporting by Chris Prentice; Editing by Lisa Von Ahn)