Trump Promised Lower Gas Prices. Here’s What’s Happening at the Pump.Trump Promised Lower Gas Prices. Here’s What’s Happening at the Pump.Trump Promised Lower Gas Prices. Here’s What’s Happening at the Pump. 

USA TODAY Network / ReutersThe national average price of gasoline fell to $3.99 per gallon this week, the first time it’s been below $4 since March 30, a month after the war on Iran began. The war virtually closed the Strait of Hormuz, an essential shipping route through which about 20% of the world’s oil supply passes. The United States and Iran signed a memorandum of understanding on June 17 that sets up negotiations…