One and done? Trump's Iran operation is unfortunately the opposite.

For more than 45 years, U.S. presidents have wanted to destroy the radical, anti-American regime in Tehran. They always concluded that the risks of war were too great — until President Donald Trump's all-out attack with Israel early Saturday.

Trump said Saturday that the massive airstrikes had killed Supreme Leader Ali Khamenei. Few outside Iran will mourn the demise of a man who spent his career shouting: "Death to America!" and "Death to Israel!" And by this limited definition, Trump's decapitation strategy may have worked. But killing Khamenei, who was aging and infirm, isn't the same thing as regime change. If there's a plan for what's next, I haven't heard any U.S. or Israeli official explain it.