Calls for regime change in Iran are growing louder in Washington and Tel Aviv. Once again, America finds itself flirting with the familiar illusion that removing a hostile ruler will automatically produce a better outcome. History suggests otherwise. A regime-change war with Iran would be a catastrophic gamble—not only because of the scale of violence it would unleash, but because no one, including the United States, has any credible idea who would replace the Ayatollah if the Islamic Republic fell.
That uncertainty was acknowledged bluntly this week by Senator Marco Rubio during testimony before the Senate Foreign Relations. . .