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Then-Deputy Secretary of Homeland Security Alejandro Mayorkas speaks at the Black Hat conference Thursday, Aug. 6, 2015, in Las Vegas. The annual computer security conference draws thousands of hackers and security professionals to Las Vegas. (AP Photo/John Locher)

Then-Deputy Secretary of Homeland Security Alejandro Mayorkas speaks at the Black Hat conference Thursday, Aug. 6, 2015, in Las Vegas. The annual computer security conference draws thousands of hackers and security professionals to Las Vegas. (AP Photo/John Locher)

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