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In page Mass surveillance in the United States:

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The PRISM special source operation system was enabled by the Protect America Act of 2007 under President Bush and the FISA Amendments Act of 2008, which legally immunized private companies that cooperated voluntarily with US intelligence collection and was renewed by Congress under President Obama in 2012 for five years until December 2017. According to The Register, the FISA Amendments Act of 2008 "specifically authorizes intelligence agencies to monitor the phone, email, and other communications of U.S. citizens for up to a week without obtaining a warrant"[citation needed] when one of the parties is outside the U.S.