President Donald Trump speaks to reporters aboard Air Force One on Saturday, March 7, 2026, as Steve Witkoff, back, Trump’s special envoy to the Middle East, and Defense Secretary Pete Hegseth, right, look on. President Trump insists conflict with Iran will be brief, but world leaders are preparing for severe economic blowback. (Tierney L. Cross/The New York Times) By TONY ROMM, COLBY SMITH and ALAN RAPPEPORT Fuel prices could soar and stay elevated for months. That could make groceries and…