(CNN) - Sen. Rand Paul is hitting the Obama administration with a major class-action lawsuit.
The Republican from Kentucky and potential 2016 presidential contender is challenging the NSA's electronic surveillance program.
Some critics argue the case has no standing and is nothing more than a political stunt.
"The interesting thing is I haven't heard much criticism. I've heard a lot of thank yous from millions and millions of people with cell phones who want us to stand up for their privacy," Paul said. "We think this lawsuit will get heard. There's already been a lawsuit like this heard simply by people who say that their privacy has been breached."
According to the lawsuit, the plaintiffs and class members want a declaration that bulk metadata collection is unconstitutional, an end to the practice and an order to purge stored data that's related to plaintiffs and class members.
President Barack Obama has defended the program but announced modest reforms to NSA's practices last month.
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