The latest developments are certain to add fuel to the politically charged debate over the attack that killed Ambassador Chris Stevens and three other Americans when insurgents struck the US mission in two nighttime attacks.
Republicans have complained that in the heat of the 2012 presidential campaign, the Obama administration was trying to conceal that the attack was the work of terrorists and not a protest over an anti-Islamic film that got out of hand.
Democrats have in turn accused Republicans of trying to capitalise on the attack to score political points. The White House has insisted that it made only a "stylistic" change to the intelligence agency talking points from which Rice suggested on five television talk shows that demonstrations over an anti-Islamic video devolved into the Benghazi attack.
"There's an ongoing effort to make something political out of this," White House spokesman Jay Carney said yesterday of the disclosure of the emails, which the administration had provided to lawmakers. "The problem with that effort is that it's never been clear what it is they think they're accusing the administration of doing."
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The report largely absolved then-Secretary of State Hillary Rodham Clinton, seen by many as the early Democratic favorite for president in 2016.
The State Department emails and other internal administration deliberations were summarised last month in an interim investigative report by Republicans on five House committees. New details about political concerns and the names of the administration officials who wrote the emails concerning the talking points emerged yesterday.