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The Senate Armed Services Committee this week added a cybersecurity “act of war” provision to its annual defense authorization measure, requiring the president to “develop a policy for determining when an action carried out in cyberspace constitutes an act of war against the United States.”

The committee completed its closed-door markup of the National Defense Authorization Act on Thursday and will soon release the contents of the bill.

But sources close to Sens. Mike Rounds (R-SD) and Angus King (I-ME)...