The account sharply conflicted with claims by U.S. Ambassador to the United Nations Susan Rice on the Sunday after the attack that the administration believed the strike was a "spontaneous" event triggered by protests in Egypt over an anti-Islam film.
"The best information and the best assessment we have today is that in fact this was not a preplanned, premeditated attack -- that what happened initially was it was a spontaneous reaction to what had just transpired in Cairo as a consequence of the video," Rice said on "Fox News Sunday" at the time.
Rep. Mac Thornberry, R-Texas, a member of the House intelligence committee, said that's consistent with what lawmakers were told in briefings.
"If there was information a day after that was to the contrary, I think Congress was misled," Thornberry told Fox News. "But again, it's even more serious than that. It means that we have a real problem in not being able to face up to the national security challenges our country faces."
"This has now turned into a very bipartisan concern," he said. "There has to be something that they're trying to hide or cover up. ... This is just not the norm. This is way out of the norm, what is happening in this case."
President Obama's aides have denied any attempt to cover things up. "No one either intentionally or unintentionally misled anyone involved in this," campaign adviser Robert Gibbs said on "Fox News Sunday." "No one wants to get to the bottom of this more than we do."
Curiously, Obama referred to "acts of terror" in his first public remarks about the attack. But from there, administration officials went on to blame the anti-Islam film.
Rice was the most explicit in that explanation, insisting in those Sunday shows that the attack was not pre-planned and was tied to the film. Obama still has not publicly and specifically described the Benghazi attack as terrorism.
But top administration officials have gradually walked back Rice's version of events. Defense Secretary Leon Panetta was the latest Thursday to declare: "It was a terrorist attack."
Secretary of State Hillary Clinton reportedly suggested Wednesday to foreign leaders visiting the United Nations summit in New York that the Al Qaeda affiliate in North Africa was involved.