Attorney General Eric Holder signed off on a controversial search warrant that identified Fox News reporter James Rosen as a “possible co-conspirator” in violations of the Espionage Act and authorized seizure of his private emails, a law enforcement official told NBC News on Thursday.

The disclosure of the attorney general’s role came as President Barack Obama, in a major speech on his counterterrorism policy, said Holder had agreed to review Justice Department guidelines governing investigations that involve journalists.
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Holder previously said he recused himself from the AP subpoena because he had been questioned as a witness in the underlying investigation into a leak about a foiled bomb plot in Yemen. His role in personally approving the Rosen search warrant had not been previously reported.

A Justice Department spokeswoman did not immediately respond to a request for comment.

The law enforcement official said Holder's approval of the Rosen search, in the spring of 2010, came after senior Justice officials concluded there was "probable cause" that Rosen's communications with his source, identified as intelligence analyst Stephen Kim, met the legal burden for such searches. "It was approved at the highest levels-- and I mean the highest," said the law enforcement official, who

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