Which president permitted the NSA to conduct international surveillance without a search warrant?

Name: Which president permitted the NSA to conduct international surveillance without a search warrant?
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Question

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President George W. Bush authorized the NSA to conduct international surveillance without a search warrant after the 9/11 attacks. President Barack Obama continued this program, and President Donald Trump has also authorized the NSA to conduct international surveillance without a search warrant.

Which President Permitted the NSA to Conduct International Surveillance Without