President Donald Trump announced an $8 billion program to help U.S. farmers cover diesel costs during the harvest season. The Agriculture Department will administer the Harvest Fuel Relief Program.

The aid will come as one-time payments through the department’s Farm Service Agency, rather than a reduction in fuel prices. Trump announced the plan Monday at a campaign rally in Kansas and on social media, and credited Republican Sen. Roger Marshall of Kansas with helping advance it.

Diesel averaged about $6.32 a gallon nationally on Tuesday, after reaching a record high in September. Higher energy costs have also affected transportation and other parts of the economy. Earlier this month, the administration moved to permit tax-exempt, red-dyed diesel, normally used in farm equipment, in standard highway vehicles.