President Donald Trump must soon decide whether to launch a major war against Iran. Buffeted by large-scale protests that have claimed thousands of lives, the Islamic Republic may be vulnerable to regime change if confronted with military strikes from the United States and Israel.

Whether regime change is a realistic goal for any strategic bombing campaign is another question. There’s reason for doubt. Still, it’s also clear that the mullahs in Tehran are rattled. For the first time in many years, the regime appears insecure. Its collapse, long hoped for by many Iranians, now seems possible if not yet probable.