The report singled out the Bureau of Diplomatic Security and the Bureau of Near East Affairs, saying there appeared to be a lack of cooperation and confusion over protection at the mission in Benghazi. The report described a security vacuum in Libya after rebel forces toppled the decades-long regime of strongman Moammar Gadhafi.
The report made 29 recommendations to improve diplomatic security, particularly at high-threat posts.
Nuland said Clinton "pledged not only to accept all 29 of the recommendations, but to have the implementation of those recommendations well under way before her successor took over. So I think she'll want to give a status on that."
Asked for the number of State Department employees fired for their handling of Benghazi, Nuland said four people were put on administrative leave. They included Eric Boswell, who resigned from the position of assistant secretary of diplomatic security.
But Nuland declined to say if Boswell and the others still are working for the department in some capacity.
Sen. John Barrasso, R-Wyo., a member of the Senate committee, questioned the status of the FBI investigation and whether any individual has been implicated.
"My last understanding is that there is no one currently still being held for questioning, no one's been prosecuted for this or held accountable even though the president promised that to be the case," he said.
Still, Barrasso insisted that the hearing will be respectful.
Presiding over the Senate session will be Sen. Bob Menendez, D-N.J., the next chairman of the Foreign Relations Committee. It would be unusual for Kerry to oversee the hearing.
"My hope is we look at this as a positive constructive opportunity to build much greater security for our diplomatic missions across the world," Menendez said. "That's how I'm going to the hearing. I hope my colleagues have the same type of view."
Associated Press writers Bradley Klapper and Andrew Miga contributed to this report.
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