The required justification for prior restraint are to demonstrate that publication of the papers would pose an inevitable, direct, and immediate threat to the United States.
The prior restraint defines as "government action that prohibits speech or other expression before the speech occurs."
For the government to take such an action—prevent speech or communication before it is permitted—the form of the speech must be such that it clearly poses an extreme danger to the community—or may pose a serious threat to national security. Another example of a "pre-emption claim" occurred in 1971, when the United States government tried to prevent the New York Times and the Washington Post from publishing classified documents known as the "Pentagon Papers" regarding the government's conduct in the Vietnam War.
To learn more about prior restraint, refer;
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