(CNN) — Media lawyers and newsroom leaders are evaluating a government memo spelling out new rules that would sharply restrict reporting at the Pentagon.

Several of the country’s biggest news outlets are publicly pushing back on the rules, foreshadowing a potential legal battle.

“This policy operates as a prior restraint on publication, which is considered the most serious of First Amendment violations,” Seth Stern, director of advocacy at the Freedom of the Press Foundation, told CNN.

The policy leverages the fact that many reporters who cover the US military have press credentials that allow physical access to the Pentagon complex.

Defense Secretary Pete Hegseth’s press office has already booted some news outlets, including CNN, from media workspaces and made key parts of the buildi

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