Sen. Lindsey Graham (R-S.C.) predicted last night “the dam’s about to break on Benghazi.”

The State Department finally responded to Graham’s request to interview five survivors of the attack, saying they have concerns about the welfare of the diplomatic security agents and “want to be careful not to interfere with the FBI’s investigation of the attack.”

“Should their identities become public, they may become targets, putting their lives, as well as those of their families and the people they protect, at increased risk,” the State Department response continued.

Graham called it “completely unacceptable.”

“The five people who were diplomatic security have never been talked to by the Congress. It’s our job to oversee and provide oversight to the executive branch,” he said on Fox News.

The senator doesn’t even know if the survivors were interviewed for the Accountability Review Board report on Benghazi. “All I know is that what we’re knowing — what we’re finding out is that the story told by the State Department, Susan Rice, the president himself was so completely wrong and false,” he said. “There’s a reason. Why did Susan Rice and the president push this narrative that it was a spontaneous event caused by a hateful video? Because if the truth had come out seven weeks before an election this was an al Qaeda-inspired pre-planned attack, it would undercut the narrative politically that bin Laden’s dead, we’re all safer.”

Graham said Gregory Hicks, the No. 2 diplomat in Libya at the time of the Sept. 11 attack, is “a professional diplomat, doesn’t want to get involved in politics, but he’s a man of conscience.” Hicks testifies tomorrow before the House Oversight and Government Reform Committee.

“He knows what happened that night. He’s the last guy to talk to Chris Stevens. He knows it was a terrorist attack from day one,” the senator continued.

“Everybody feels chilled. I’ve been asking for survivors to come forward, people who were involved, not just survivors, and every agency in the government is stonewalling. These guys are whistleblowers. They came forward out of conscience. Greg Hicks knew that Chris Stevens was being thrown under the bus. ‘Chris should have never been there.’ That’s the new narrative. Well, they knew he was in Benghazi. So the people who knew Chris Stevens, who lived through this attack, believe that what they went through has been misrepresented.”

Graham confirmed that he’s heard people in the CIA who want to come forward and testify have been told by director John Brennan that they’d be subject to polygraph if they get involved.

“I know there are some CIA agents reaching out. They feel frustrated. The CIA generally got this right, and they feel frustrated about what happened that night before and after. So we’ll see where this goes,” he said.