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To legally justify its military actions against the Islamic State, the U.S. has relied on a piece of 2001 legislation, written years before the extremist group came into existence.

Now 46 representatives from both parties say in a letter to Speaker Paul Ryan that it's time for Congress to "immediately begin a serious debate" on authorization for the use military force against the Islamic State.

The National Security Agency is scaling back the way it spies on some communications over the Internet.

The NSA says it discovered what it called "lapses" in compliance with U.S. law.

They're called "about" communications: The NSA not only watches messages traveling to and from a foreign target, but those that mention one.

That can mean the NSA sometimes sweeps up data from Americans without a warrant. In the past, officials said the spy agency was still mindful of citizens' privacy.

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