Rand Paul is urging anyone in the US with a mobile phone to join the group action which declares the government is not permitted to access the public’s emails and phone records without a warrant.
Mr Paul said the purpose of the action is to “protect the Fourth Amendment,” the part of the US Constitution which prevents unreasonable searches and seizures.
“The question here is whether or not, constitutionally, you can have a single warrant apply to millions of people,” he told Fox News.
“So we thought, what better way to illustrate the point than having hundreds of thousands of Americans sign-up for a class-action suit.”
Mr Paul’s move comes as a secretive US intelligence court decided the NSA can continue to collect phone data from American citizens for at least another 90 days.
The Foreign Intelligence Surveillance Court (FISC) renewed the NSA surveillance programme on Friday, despite a panel of advisors advising the President Obama that a warrant must be obtained for each search.