Diesel prices are shooting toward record highs, breaking Trump's campaign promise to cut energy costs in half — bad news for anyone who buys food or goods.

• Trump pledged to halve energy costs within his first year in office; the opposite has happened.
• Diesel was under $5 a gallon when he took office and is now pushing $6 nationally and close to $8 in California.
• Diesel moves almost everything Americans eat and buy, so higher prices feed into the cost of everything.
• The turn on energy is tied to Trump following a foreign government's wishes rather than his own voters'.

Outlook: If diesel keeps climbing, expect another round of price increases across groceries and retail, and growing anger from the voters who backed him on cheap energy.