The administration plans to ask Congress to allow year-round sales of E15, folding the measure into a supplemental request to lawmakers as it looks to curb fuel costs.
E15 contains 15% ethanol and is usually sold only under EPA waivers because it evaporates faster in hot weather, raising smog concerns and normally forcing a switch to costlier summer blends.
The push comes as gasoline prices rise with the war with Iran; industry backers say E15 runs about 25 cents a gallon below regular gas and supports rural jobs.
Trump already used emergency waivers in March to permit summer E15 sales, but a permanent nationwide change now depends on winning enough votes in Congress.