People walk on the Columbia University campus in New York City on July 1, the day the federal student loan interest rate hike kicked in. Mario Tama/Getty Images hide caption

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Veetek Witkowski holds a newly assembled AR-15 rifle at the Stag Arms company in New Britain, Conn., in April. Charles Krupa/AP hide caption

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Sen. Susan Collins, R-Maine, is among the lawmakers who say they were never briefed about the government's surveillance programs. T.J. Kirkpatrick/Getty Images hide caption

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