Senate Republicans are increasingly criticizing the administration over the lack of clear objectives and limited updates on the Iran war, as disrupted shipping routes drive up energy costs and weigh on GOP candidates. Oil prices have approached $106 a barrel, the national average gasoline price has risen to $4.37 a gallon, and diesel has reached $6.31, hitting Alaska, Nebraska, Iowa and Maine especially hard. Some Republicans are considering an embargo on U.S.-produced diesel exports to reduce domestic prices. Sen. Lisa Murkowski said senators received a conflict cost estimate from Defense Secretary Pete Hegseth before the August recess but no significant update since. Other lawmakers, including Sens. Joni Ernst, Susan Collins, John Curtis and John Cornyn, have questioned the administration's planning and communication. President Trump said in March that the conflict would last four or five weeks, but it has continued for nearly seven months. He declared total and complete victory early in the conflict, yet no peace deal has restored oil shipments through the Strait of Hormuz. Iranian-backed Houthi militias have also threatened Red Sea shipping, seized strategically important islands near shipping lanes and damaged a Saudi oil pipeline used as an alternative route. Two Iowa House Republicans, Zach Nunn and Mariannette Miller-Meeks, voted Wednesday for a war powers resolution directing Trump to end the conflict after previously opposing it. Polling shows broad public opposition: a New York Times/Siena survey of 1,503 voters conducted Sept. 8-13 found that 66% disapproved of the war and 31% approved, while 63% said starting it was the wrong decision and 32% said it was right.