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FILE - In this March 26, 2015 file photo, House Homeland Security Chairman Rep. Mike McCaul, R-Texas speaks on Capitol Hill in Washington. U.S. law enforcement officials expressed concern Wednesday about the growing use of encrypted communication and private messaging by supporters of the Islamic State, saying the technology was complicating efforts to monitor terror suspects and extremists. (AP Photo/Lauren Victoria Burke, File)

FILE - In this March 26, 2015 file photo, House Homeland Security Chairman Rep. Mike McCaul, R-Texas speaks on Capitol Hill in Washington. U.S. law enforcement officials expressed concern Wednesday about the growing use of encrypted communication and private messaging by supporters of the Islamic State, saying the technology was complicating efforts to monitor terror suspects and extremists. (AP Photo/Lauren Victoria Burke, File)

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