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President Trump avoided asking Congress for permission before striking Iran, despite the Constitution saying only the legislature can declare war.

By Michael Crowley and Edward Wong

Michael Crowley and Edward Wong report on diplomacy and foreign policy from Washington and have covered international news for decades.

Before he ordered strikes against Iran’s nuclear facilities, President Trump did not seek permission from Congress, to which the U.S. Constitution grants the sole power to declare war. Many Democrats and even some Republicans say that the attack was tantamount to a declaration of war and that Mr. Trump acted illegally.