The Wall Street Journal | Karl Rove: The killing of Iranian Maj. Gen. Qasem Soleimani has produced President Trump’s biggest foreign-policy challenge yet.

Will Iran be content with Tuesday night’s barrage of missiles, or will there be other attacks on Americans and U.S. allies? So much depends on what former British Prime Minister Harold Macmillan called “events, dear boy, events” and the unpredictable reactions they so often provoke.

As of Wednesday, both the U.S. and Iran appear to want de-escalation, a good thing. Let’s hope that lasts.

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