Kentucky Senator Rand Paul announced that he has filed one of the largest class-action lawsuits in history in response to spying operations by the National Security Agency against American citizens.

The suit was joined by the conservative advocacy group FreedomWorks and filed in the U.S. District Court in the District of Columbia.

The suit claims the NSA’s program that collects the metadata of American’s phone calls violates the Fourth Amendment of the Constitution.  The lawsuit wants the court to rule the program unconstitutional and order the government to immediately stop the program.

“There’s a huge and growing swell of protest in this country of people who are outraged that their records would be taken without suspicion, without a judge’s warrant and without individualization,” Sen. Paul told reporters.

A Justice Departments spokesman said that they expect to win the case because at least 15 other judges have ruled the program legal.