A man fuels up his vehicle at a gas station during a gas giveaway event in Chicago last month. More than 6 in 10 Americans say their household's finances have taken a hit from higher gas prices, according to a poll taken in May. | REUTERS Officials of U.S. President Donald Trump’s administration are scrambling to contain the economic and political fallout of the war with Iran, three people familiar with the White House’s discussions said, as hopes for a quick resolution fade. Trump this week backed suspending the federal gas tax, a step that would knock 18 cents a gallon off motor fuel prices currently averaging more than $4.50 a gallon nationwide. Once viewed by some White House aides as unnecessary, the idea is gaining urgency as officials run low on options to show they are tackling rising costs, said ​the people, who spoke on the condition of anonymity to discuss sensitive internal deliberations.…