Lawful is a pretty strong word, it implies some form of enforcement agency is associated with that law. In the case of EPA regs, they may take effect after some complete failure at the local or state level (i.e., the Flint Water supply debacle).
This past summer, the EPA revised their rules to allow storage of E15 fuel in E10 tanks. Some fear this will lead to higher ethanol concentrations, but the ethanol industry hopes it will aid in the acceptance of E15 by the retailers (i.e., less equipment cost).
Having disrupted the agricultural commodities markets with their Tariff campaign, the current administration, is using this revised regulation as a price support to offset the Tariff impacts. In blunt terms, the same choice would been made without Tariffs. The US Ag industry wants the market and several mid-western states are dependent on the farm income. It's the same situation with Coal producers demanding relaxed environmental standards to prevent power plant conversion to NG. KY, WV and parts of other states are dependent on the coal income and want to skew the market.
To me this is actually quite hilarious. Prior to the last election, the AMA was all excited about the ethanol issue. Their candidate was going to end all this..... Three years later, the AMA is silent and their candidate is pushing E15. Of course, Washington will do what's needed to preserve the Ag industry, we can't change that. However, I do feel it's important to identify the hypocrisy and bias of the AMA.