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One senior official, who like others spoke on the condition of anonymity because of the sensitive nature of the memo, described the document as “a wake-up call.” But White House officials dispute that view, insisting that for 15 months they had been conducting detailed planning for many possible outcomes regarding Iran’s nuclear program.

In an interview on Friday, General Jones declined to speak about the memorandum. But he said: “On Iran, we are doing what we said we were going to do. The fact that we don’t announce publicly our entire strategy for the world to see doesn’t mean we don’t have a strategy that anticipates the full range of contingencies — we do.”