President Trump suggested banning U.S. diesel exports, sending shares of major refiners including Valero, Marathon and Phillips 66 lower amid concern that export limits would reduce overseas revenue. No official policy has been enacted. The European Union has warned that restrictions could harm both sides of the Atlantic, while Energy Secretary Chris Wright said the administration would not halt diesel exports and was instead pursuing voluntary measures intended to ease U.S. prices while preserving global supplies. Industry groups have opposed export limits, arguing that lower refinery utilization would tighten gasoline and jet-fuel supply, raise costs and weaken U.S. energy influence as diesel prices remain elevated amid global refining disruptions and geopolitical risks.