When Americans expressed outrage last week over the seizure and surveillance of Verizon’s client data by the National Security Agency, President Obama responded: “In the abstract, you can complain about Big Brother . . . but when you actually look at the details, I think we’ve struck the right balance.”

How many records did the NSA seize from Verizon? Hundreds of millions. We are now learning about more potential mass data collections by the government from other communications and online companies. These are the “details,” and few Americans consider this approach “balanced,” though many rightly consider it Orwellian.

These activities violate the Fourth Amendment, which says warrants must be specific—”particularly describing the place to be searched, and the persons or things to be seized.” And what is the government doing with these records? The president assures us that the government is simply monitoring the origin and length of phone calls, not eavesdropping on their contents. Is this administration seriously asking us to trust the same government that admittedly targets political dissidents through the Internal Revenue Service and journalists through the Justice Department?

…Monitoring the records of as many as a billion phone calls, as some news reports have suggested, is no modest invasion of privacy. It is an extraordinary invasion of privacy. We fought a revolution over issues like generalized warrants, where soldiers would go from house to house, searching anything they liked. Our lives are now so digitized that the government going from computer to computer or phone to phone is the modern equivalent of the same type of tyranny that our Founders rebelled against.

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