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By The Editorial Board

The editorial board is a group of opinion journalists whose views are informed by expertise, research, debate and certain longstanding values. It is separate from the newsroom.

A nuclear-armed Iran would make the world less safe. It would destabilize the already volatile Middle East. It could imperil Israel’s existence. It would encourage other nations to acquire their own nuclear weapons, with far-reaching geopolitical consequences.

Now, however, Prime Minister Benjamin Netanyahu of Israel has acted to destroy Iran’s capacity to build nuclear weapons without first shoring up allies’ support. The United States faces being dragged into another war in the Middle East, with American lives at stake. And while the world tries to figure out what President Trump will do in the coming days, that is the wrong question. If Mr. Trump wants the United States to join the Israeli war against Iran, the next step is as clear: Congress must first authorize the use of military force.