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.

“I am troubled by the possibility that leak investigations may chill the investigative journalism that holds government accountable,” Obama said. “Journalists should not be at legal risk for doing their jobs.”…

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 spoke on condition of anonymity. He said that explicitly included Holder.