Final answer:
The Nixon administration's attempt to stop publication of the Pentagon Papers demonstrates the principle of prior restraint.
Step-by-step explanation:
The Nixon administration's attempt to stop publication of the Pentagon Papers demonstrates the principle of prior restraint. Prior restraint refers to government restrictions on the publication or dissemination of information before it is published. In this case, the Nixon administration sought to prevent the publication of classified documents that revealed the truth about the U.S. government's involvement in the Vietnam War.
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