Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) is vowing to "get to the bottom" of comments made by former FBI Deputy Director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE after the latter detailed conversations he had with other top officials about the possibility of removing President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE from office via the 25th Amendment.

In an interview Sunday with CBS's "Face the Nation," Graham questioned whether the former deputy FBI chief's comments had revealed an "attempted bureaucratic coup" against the president.

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"It's stunning to me that one of the chief law enforcement officers of the land, the acting head of the FBI, would go on national television and say, 'Oh by the way, I remember a conversation with the deputy attorney general about trying to find if we could replace the president under the 25th Amendment,'" Graham said Sunday.

"We're a democracy. People enforce the law. They can't take it into their own hands. And was this an attempted bureaucratic coup? I don't know. I don't know who is telling the truth. I know Rosenstein vehemently denied it but we’re going to get to the bottom of it,” he continued, referring to former Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE.

Sen. Lindsey Graham on alleged discussion of using 25th Amendment to remove President Trump: "We're a democracy. People enforce the law. They can't take it into their own hands. And was this an attempted bureaucratic coup? I don't know. I don't know who is telling the truth" pic.twitter.com/RNt9prdOOZ — CBS News (@CBSNews) February 17, 2019

Graham's comments referred to an interview the former deputy FBI chief gave with CBS News's "60 Minutes" program in which he explained that Justice Department officials met to discuss the possibility of removing Trump via the 25th Amendment, which allows a president's advisers to declare them unfit for duty.

“Discussion of the 25th Amendment was simply ... Rod [Rosenstein] raised the issue and discussed it with me in the context of thinking about how many other cabinet officials might support such an effort,” McCabe said during the interview.

The White House slammed McCabe's credibility after the interview, accusing the former law enforcement official of harboring a "selfish and destructive agenda."

"His selfish and destructive agenda drove him to open a completely baseless investigation into the president,” press secretary Sarah Huckabee Sanders said last week. “Andrew McCabe has no credibility and is an embarrassment to the men and women of the FBI and our great country.”