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Iran has never made the decision to build a nuclear weapon, despite having at least most of the resources and capabilities it needs to do so, as far as we know. But Mr. Raisi’s death has created an opportunity for the hard-liners in the country who are far less allergic to the idea of going nuclear than the regime has been for decades.

The recent exchange of hostilities with Israel, a country with an undeclared but widely acknowledged nuclear arsenal, has provoked a change of tone in Tehran. “We have no decision to build a nuclear bomb but should Iran’s existence be threatened, there will be no choice but to change our military doctrine,” Kamal Kharrazi, a leading adviser to Iran’s supreme leader, said on May 9.

Today, Iran has thousands of advanced centrifuges and a large stockpile of enriched uranium. This, in turn, has provoked some camps inside Iran to adopt a “might as well” argument for nuclear weaponization. If we’ve already come this far, the argument goes, then why not just go for a bomb?

Historically, Iran has felt a nuclear hedging strategy is its best defense against external aggression and invasion. And Tehran may continue to calculate that racing for a bomb would only invite more hostility, including from the United States. Then again, an increasingly distracted and unpredictable Washington might not be in a position to react forcefully against a sudden and rapid Iranian rush for a bomb, especially if Iran chooses its moment wisely.Between the war in Gaza, a possible change in American leadership, and a domestic power vacuum that the I.R.G.C. could step into, it is not difficult to imagine a brief window in which Iran could pull out the stops and surprise the world by testing a nuclear device.