AFP examines the reasons below:
Why Trump wants a ban
Average diesel prices have struck record highs in recent weeks, pushing US prices to a fresh peak of $6.53 per gallon on Tuesday, according to the motorists' association AAA.
Prices have surged from $3.76 a gallon at the start of the US-Iran war in late February.
Soaring fuel prices threaten to cost Trump's Republicans their control of Congress in November's midterms.
Diesel is used largely i…