On the eve of the release of a potentially explosive new report, Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE defended the termination of the FBI’s top two former executives and warned that the forthcoming report on the FBI's handling of the Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE email probe could result in more people being fired.

In an exclusive interview with The Hill’s new TV show "Rising," which aired Thursday morning, Sessions defended the decision to fire ex-Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE, whom he said “made a big mistake” that belied a “serious breach of discipline.”

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Sessions also made clear that he is open to firing more employees if the Justice Department inspector general’s soon-to-be-released report warrants it.

“I think it will be a lengthy report and a careful report,” he told "Rising" co-host Buck Sexton. “I think it will help us better fix any problems that we have and reassure the American people that some of the concerns that have been raised are not true.”

“If anyone else shows up in this report to have done something that requires termination we will do so,” he added.

Sessions spoke to “Rising” just hours before Justice Department Inspector General Michael Horowitz is expected to release a report on Comey’s handling of the Clinton email case in 2016 and his subsequent firing by President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in 2017.

Published reports have said the report concludes Comey was insubordinate as FBI director when he refused Justice Department advice and announced a renewal of the Clinton email case just days before the 2016 presidential election.

Sessions said he is certain that Comey’s firing was justified.

“It was the right thing to do. The facts were pretty clear on it. He made a big mistake and he testified only a few weeks before that termination that he would do it again if he had the opportunity. So we felt like there was a serious breach of discipline within the department if we allowed him to continue.”

Trump has indicated various motives for firing the former FBI director. The termination was recommended in a memo written by 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 that referenced Comey's "handling of the conclusion of the investigation of Secretary Clinton's emails."

Sessions also said the termination earlier this year of 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 for allegedly lying to investigators about his media contacts was also “the right decision.” McCabe's termination resulted from a separate report from Horowitz charging Comey's former deputy with unauthorized leaking.