Sen. Lindsey Graham told Fox News on Thursday that he wants to bring back James Comey to testify on Capitol Hill, citing concerns about his statements on the conclusion of the Hillary Clinton email case.

“This doesn’t add up, and I smell a rat here,” Graham, R-S.C., said in an interview with Fox News' Catherine Herridge.

The Republican senator, who chairs a Senate Judiciary subcommittee, and Judiciary Committee Chairman Chuck Grassley, R-Iowa, last week revealed new details they learned about the Clinton case from interview transcripts. According to the senators, the transcripts say Comey began drafting an “exoneration statement” for Clinton weeks before interviewing her – which in turn raised questions about the former FBI director’s testimony in June before the Senate Intelligence Committee.

At the time, Comey was asked whether his decision to announce the results of the investigation in July 2016 was influenced by then-Attorney General Loretta Lynch’s infamous meeting days earlier on an Arizona tarmac with former President Bill Clinton.

COMEY 'EXONERATION STATEMENT' FOR CLINTON CALLS TESTIMONY INTO QUESTION

“Yes, in an ultimately conclusive way, that was the thing that capped it for me – that I had to do something separately to protect the credibility of the investigation,” Comey said.

U.S Senator Lindsey Graham attends the 53rd Munich Security Conference in Munich, Germany, February 19, 2017. REUTERS/Michaela Rehle - RTSZCF0 (REUTERS)

Yet the transcripts suggest Comey was planning a statement weeks, if not months, earlier. Graham said Thursday he doesn’t think Comey perjured himself, but suggested the interview transcripts raise questions that must be resolved.

“He needs to come back to committee,” Graham said.

Graham said there are two issues he wants to discuss.

The first is whether Comey had “predetermined the result” of the email probe before the Clinton interview, “contrary” to his testimony.

The second concerns Comey’s claim that he jumped into the fray because of the tarmac meeting. Graham said he has reason to believe the “real reason may have been some email between the DNC and the Justice Department about the scope of the Clinton investigation,” and this would be “completely different than when he publicly testified.”

Graham explained that while Comey cited the tarmac meeting in his testimony, the fired FBI director has said in other settings “that the real reason he got involved was because he thought that there was an email the Russians had between the DNC and Justice Department trying to wire the Clinton investigation.”

Further, he noted that if Comey “had actually made up his mind about the disposition of the case before the Lynch/Bill Clinton meeting, that seems to have fallen by the wayside.”

The transcripts in question were from interviews conducted by the Office of Special Counsel, which interviewed James Rybicki, Comey’s chief of staff, and Trisha Anderson, the principal deputy general counsel of national security and cyberlaw, the GOP senators said.

The notes reflect claims that Comey “wrote a draft” of his exoneration statement around early May 2016. Another passage suggests Comey sent around a draft in an attempt to be “forward-leaning” given the “direction the investigation” was headed.

It remains unclear whether Comey could have drafted a similar statement for a scenario in which charges would be filed against Clinton.

Comey, whom President Trump fired in May amid tensions over the Russia probe, also testified in June there were “other things” that contributed to his decision to go public, including Lynch allegedly urging him to refer to the email probe as a “matter” and not an “investigation.”

In his July 2016 announcement, Comey famously called Clinton’s email arrangement “extremely careless” though he decided against recommending criminal charges.

Fox News’ Catherine Herridge contributed to this report.