diesel trades on a world market, just like corn. farmers don't sell cheaper to Americans, and refiners can't either since they buy crude at global prices. force a lower price and they'll make less diesel. less supply means higher prices, not lower.
A suggestion 4 Pres Trump: Since ur hearing frm Big Oil abt diesel prices & the problems w an embargo tell Big Oil 2reduce their prices 4 Americans/not charge global price This is an America 1st issue WHY B ENERGY INDEPENDENT IF WE ARENT GOING 2USE IT WHEN WE NEED IT