The U.S. struck Iran overnight in the latest example of a president bypassing Congress to order military action.Why it matters: The Constitution says only Congress can declare war — but Democratic and Republican presidents alike have ordered military force without authorization for more than 75 years. Driving the news: The U.S. and Israel launched strikes on Iranian senior commanders and political leaders, including Supreme Leader Ali Khamenei, in an effort to destabilize the regime"We're going...