The declassification could also allow Trump administration officials to leak the names on the list without violating laws against disclosing classified information, the very issue that Durham is investigating.
Flynn later pleaded guilty to lying to investigators about the conversations in a case that the Justice Department abruptly moved to drop last week, prompting accusations of politicisation from former law enforcement officials.
The dropped case ignited an intensified phase of the attacks by Trump and his allies on the Russia investigation. Trump has begun on Twitter to label his counterargument "OBAMAGATE!" and promoted news articles about Grenell's declassification.
On Dec. 29, 2016, routine American surveillance of Sergey I. Kislyak, then the Russian ambassador to the United States, picked up multiple conversations with Flynn. At one point, Flynn asked Russia to refrain from retaliating against the Obama administration's sanctions imposed as punishment for Moscow's election interference.
Rep. Devin Nunes, R-Calif., a member of the House Intelligence Committee who has championed Flynn's cause, has long said that Obama officials acted improperly in requesting that associates of Trump be revealed to them from surveillance transcripts. Trump has accused Susan Rice, Barack Obama's national security adviser, of committing a crime by seeking to learn the identities of Trump associates caught in intelligence surveillance. Trump has never provided any evidence to support his claim.
Names of Americans swept up in wiretaps of foreign officials by spy agencies are blacked out of transcripts to prevent such eavesdropping from becoming a tool for improper domestic surveillance, but experts said that Rice's requests to see, or "unmask," them were a justifiable step.
Officials must provide a reason to view the information, like trying to better understand the significance of an electronic intercept or the strategy of a potentially adversarial government, Aftergood said.
But declassifying or publicly revealing which officials make those requests is highly unusual, he added.
Rice has said she does not remember specifics of her requests, according to transcripts of questioning by congressional investigators released last week. But, she said, she was trying to understand Russia's election interference and would have been concerned about an official outside government, as Flynn was at the time, talking to foreign adversaries in a way that could have undermined the sitting administration's policy.
Republicans have renewed their focus on Rice in recent days. On Fox News on Monday evening, Republican former Rep. Trey Gowdy pointed to a partially declassified memo from Rice, which said Obama raised concerns about sharing information about Russia with the incoming administration. Gowdy called on the rest of the memo to be declassified and released.
Written by: Julian E. Barnes and Katie Benner
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