South Carolina Sen. Lindsey Graham reiterated his pledge to block all of Obama’s nominees for executive branch positions until Congress is allowed to hear testimony from those on the ground during the Benghazi terrorist attacks in 2012.

“I shouldn’t have to do this – to make these threats,” he said on “Fox News Sunday.”

Graham says there are still too many unanswered questions about the Sept. 11 attack in Libya that killed U.S. Ambassador Chris Stevens and three other Americans.

While there have been a number of Capitol Hill hearings on the deadly attack in Benghazi, Graham is among a group of lawmakers who say they aren’t satisfied with the information provided and want more.

“I don’t think it’s over the top to find out what happened to four dead Americans,” he said. “I don’t think it’s over the top to talk to survivors. The State Department interviewed these survivors.”