A “target” under the act is a person or entity the government wants information on — not the people the government is trying to listen to. It’s actually O.K. under the act to grab Americans’ messages so long as they are communicating with the target, or anyone who is not in the United States.

Leave aside the Patriot Act and FISA Amendments Act for a moment, and turn to the Constitution.

The Fourth Amendment obliges the government to demonstrate probable cause before conducting invasive surveillance. There is simply no precedent under the Constitution for the government’s seizing such vast amounts of revealing data on innocent Americans’ communications.

The government has made a mockery of that protection by relying on select Supreme Court cases, decided before the era of the public Internet and cellphones, to argue that citizens have no expectation of privacy in either phone metadata or in e-mails or other private electronic messages that it stores with third parties.