The Pentagon has unveiled new restrictions on media covering the US military, requiring them to pledge not to disclose anything not formally authorized for publication and limiting their movements within the department. Daniel Slim/AFP/Getty Images

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 th

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