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A key question raised Monday by the senators is which officials or agency edited a set of unclassified “talking points” about the attack that U.S. intelligence analysts prepared several days after the assault.

Although U.S. intelligence concluded within hours that the attack likely was organized by members of a militia linked to al Qaeda, the talking points did not refer to it as a terrorist attack and the reference to an al Qaeda link was deleted.

A U.S. intelligence official told The Times last year that the al Qaeda link was removed from the talking points because it came from highly classified communications intercepts and that the FBI wanted the link deleted so as not to prejudice its investigation.

Last week, some committee members and staffers were briefed on the drafting of the talking points and saw email traffic between administration officials making edits on the document.

On Sunday, Mr. Graham said the email traffic was too heavily redacted to be useful. But a spokesman for the senator said Monday that Mr. Graham had no direct knowledge of what the committee reviewed.

“We aren’t sure what the Intel Committee has received,” Graham spokesman Kevin Bishop said via email.

A Senate staffer told The Times that the emails about the talking points were not redacted and answered committee members’ questions about the drafting.

“There is a lot of confusion about the documents that have been made available,” the staffer said, adding that the emails and other documents were provided to the committee as part of its probe into the Benghazi attack.

“We have now started to get what we asked for,” the staffer said.

Ms. Hayden, the White House spokeswoman, said administration officials “are having conversations with members of Congress about their requests [for information on Benghazi] and we will continue those conversations.”