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SAN FRANCISCO, CA - JUNE 05:  A man uses a smartphone as he sits in Union Square on June 5, 2013 in San Francisco, California.  According to a study by the Pew Internet & American Life Project, over half of American adults, or 56 percent, have smartphones, up from 35 percent two years ago.  (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - JUNE 05:  A man uses a smartphone as he sits in Union Square on June 5, 2013 in San Francisco, California.  According to a study by the Pew Internet & American Life Project, over half of American adults, or 56 percent, have smartphones, up from 35 percent two years ago.  (Photo by Justin Sullivan/Getty Images)

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    Sen: No proof call tracking stops terror

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Sen: No proof call tracking stops terror

Sen. Mark Udall (D-CO) is "unconvinced" data collection has stopped terror plots and wants an open debate about privacy.

Sen: No proof call tracking stops terror

Sen. Mark Udall (D-CO) is "unconvinced" data collection has stopped terror plots and wants an open debate about privacy.