The Globe and Mail reports in its Friday edition that the Iran war has sent diesel prices soaring around the world, straining national budgets, adding costs to businesses and snarling supply chains from farms to ports. A New York Times dispatch to The Globe says that now President Donald Trump is threatening to ban or restrict exports of diesel from the United States, which is the top supplier to more than a dozen countries, including Mexico, Canada and Europe. The result could be global price spikes on everything from groceries to jet fuel. Often called the workhorse fuel of the economy, diesel is made from crude oil at refineries. The main reason for the price jump is a lack of refining capacity caused by the war in Iran. In addition, Ukraine has attacked and damaged many Russian refineries. That has forced Russia, a major exporter, to hoard its supplies. In the U.S., retail diesel prices climbed last month to a record high of more than $6.50 (U.S.) a gallon -- nearly 70 per cent more than this time in 2025. That has put intense pressure on Mr. Trump and Republicans to find ways to lower costs, particularly before the midterm elections in November. (Canada's top diesel producers are Imperial Oil, Cenovus and Suncor.)