In U.S. President Donald Trump’s mind, he has tried a limited war, diplomacy and economic coercion against Iran but has still failed to achieve his objectives. What he hasn’t tried is an all-out war against Iran, which he might consider once the midterm elections are over, says Trita Parsi, executive vice-president of the Washington-based Quincy Institute. Speaking on The Hindu’sThe View from India podcast, Mr. Parsi said Iran wants a new, uncontested order in the Persian Gulf and appears prepared to fight a long battle. Edited excerpts: