Sen. Lindsey Graham (R-S.C.) said on "Hannity" that if former FBI Acting Director Andrew McCabe and Deputy Attorney General Rod Rosenstein discussed using the 25th Amendment it would be "one of the most significant moments in American history."

McCabe told "60 Minutes" Sunday that Rosenstein was "absolutely serious" about wearing a wire to record Trump following FBI Director James Comey's firing in 2017. He also confirmed that he ordered an obstruction of justice probe against the president.

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Rosenstein has denied he "pursued or authorized recording the president" and also has denied McCabe's suggestion that they discussed invoking the Constitution's 25th Amendment to potentially remove Trump from office.

Trump reacted to McCabe's interview Sunday night, tweeting that he was telling "so many lies" and that his story is now "even more deranged."

A spokeswoman for McCabe said the former FBI official never participated in any "extended discussions" about using the 25th Amendment. 

Graham, chairman of the Senate Judiciary Committee, said he intends to hold hearings and issue subpoenas to figure out "who's lying" about what transpired in May 2017. He said top Justice Department and FBI officials may have started the counter-intelligence investigation in 2016 as a "backdoor way to get into the Trump campaign."

"They acted as if they were out to get Trump," said Graham, explaining that such probes are usually initiated to protect a target or campaign from foreign interference.

Graham said he believes Hillary Clinton was not charged over her private email server because the people conducting the investigation "wanted Trump to lose" the election.

"I don't know if that's true or not, but that's what we're gonna look at. It sure sounds that way."

Watch the full interview above.

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