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The Obama administration has declined to respond to media requests for details about who was watching the live video feed. A senior defense official told The Washington Times last year that “the surveillance aircraft captured footage of events on the ground” and “it wasn’t available that night at the White House.”

The question is significant because defense officials have said that a lack of accurate intelligence about conditions on the ground was one reason they were not able to deploy military forces to attempt a rescue.

Earlier this month, another Republican senator, Bob Corker of Tennessee, who is the new ranking member of the Foreign Relations Committee in the Democrat-controlled Senate, suggested that Mrs. Clinton is eager to try to address unanswered questions.

“I actually sense — especially in talking to her chief [of staff] just in the last few days — that she’s anxious to want to come up and testify on Benghazi,” he told MSNBC.

“And I think that’s an important thing both for her but, obviously, for our country.”

The State Department official added that Mrs. Clinton was working hard to prepare for her appearance Wednesday and would be prepared to answer any questions.

Mrs. Clinton was originally scheduled to testify in December. But after dehydration from a stomach virus caused her to faint and hit her head, which subsequently led to a blood clot inside her skull, she canceled.

She was discharged two weeks ago from a New York hospital. Doctors have said that the clot did not result in a stroke or neurological damage and that they expect her to recover fully.