The Trump administration is closer to a major war in the Middle East than most Americans realize. It could begin very soon.Why it matters: A U.S. military operation in Iran would likely be a massive, weeks-long campaign that would look more like full-fledged war than last month's pinpoint operation in Venezuela, sources say.The sources noted it would likely be a joint U.S.-Israeli campaign that's much broader in scope — and more existential for the regime — than the Israeli-led 12-day war last June, which the U.S. eventually joined to take out Iran's underground nuclear facilities. Such a war would have...