(CNN) - Sen. Lindsey Graham is doubling down on his promise to filibuster any White House nominees until he gets answers on Benghazi.
When the South Carolina Republican has asked for survivors of the September 2012 attack on the U.S. diplomatic mission to be interviewed by Congress, the response, he said, was "take a hike."
The refusal to make the survivors available is "an unacceptable way for the Obama administration to behave," Graham told Wolf Blitzer on CNN's "The Situation Room."
Graham's determination on getting answers stems from an explosive report Sunday from CBS's "60 Minutes" on the attack, he said.
As a member of the Senate minority, Graham is unable to subpoena witnesses on his own, he said. "All I can do is have what leverage I have," he said, meaning holding up the nominees. "I don't like doing this. It's not my nature."