The Defense Headquarters' new media policy violates the First Amendment to the US Constitution, the newspaper writes.
Under the new rules that came into effect in October, reporters must sign a 21-page form with rules for journalistic activities.
According to the lawsuit, the Pentagon's new rules aim to "close the Pentagon's doors - the areas that have historically been open to the press - to news organizations, like the plaintiffs, that investigate and report without fear or favoritism on the actions of the department and its leadership."
The newspaper wants the court to rule that the Pentagon may not apply its new rules.
