A new front opened in an old war Thursday as 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 and former acting FBI 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 traded verbal blows about the feverish days following 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’s firing — and about FBI conduct more generally.

The conflict will strengthen the belief of Trump’s detractors that the president is unfit for office, even as his supporters will seize on McCabe’s comments to buttress their own allegations of anti-Trump bias at the intelligence agency.

The fuse has been lit by a forthcoming memoir from McCabe, “The Threat,” and an interview he has given to CBS’s “60 Minutes” to publicize it.

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The journalist who conducted the interview, Scott Pelley, said on “CBS This Morning” Thursday that McCabe confirmed there had been discussions at the Justice Department about removing Trump under the 25th Amendment.

“The highest levels of American law enforcement were trying to figure out what to do with the president,” Pelley said, referring to the period after Comey’s firing in May 2017.

The full “60 Minutes” interview with McCabe will air on Sunday.

Meanwhile, The Atlantic published an except from McCabe’s book Thursday in which he called Trump “a person who cannot be trusted” and “a deliberate liar.”

Some observers argue that the controversy is inherently problematic for the president.

Former deputy assistant attorney general Harry Litman told The Hill, “to me it is a vivid return to the days of May 2017 ... how harrowing and unprecedented it was to encounter [a president] who was so lawless and so dishonest.”

But defenders of the president claimed that McCabe was proving their points for them.

“He has contributed greatly to the literature of confession,” said Joe diGenova, a former U.S. attorney for the District of Columbia and a staunch Trump backer. He said McCabe “actually admits to having participated in an [attempted] coup d’état.”

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Many of the details of the feverish period around Comey’s firing had already been reported, but McCabe’s willingness to step into the spotlight brought a predictably furious response from Trump.

“Disgraced FBI Acting Director Andrew McCabe pretends to be a ‘poor little Angel’ when in fact he was a big part of the Crooked Hillary Scandal & the Russia Hoax — a puppet for Leakin’ James Comey,” Trump wrote on Twitter. “I.G. report on McCabe was devastating.”

The report to which Trump was alluding, from Justice Department Inspector General Michael Horowitz, accused McCabe of lying at least four times — three of which were under oath — regarding the disclosure of sensitive information.

McCabe was fired by 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 in March 2018, days before his planned retirement.

McCabe’s apparent confirmation that a use of the 25th Amendment was considered is explosive.

The amendment provides for the replacement of the president by the vice president in the event that the vice president and a majority of the Cabinet asserts that the president “is unable to discharge the powers and duties of his office.”

To Trump detractors, the consideration of such an action confirms that the president poses a threat to the norms of American public life; to his supporters, it is those who are considering using the amendment to overthrow an elected president who are the threat.

McCabe’s “60 Minutes” interview apparently leaves no doubt about the seriousness of the effort.

According to Pelley, the scenario McCabe describes is one in which, “They were counting noses … They were speculating, ‘This person would be with us, that person would not be.’ ”

Rosenstein, who remains in office as deputy attorney general, disputes McCabe’s account, however.

"The Deputy Attorney General again rejects Mr. McCabe’s recitation of events as inaccurate and factually incorrect,” a spokesperson for the Department of Justice said.

The spokesperson added, “As the Deputy Attorney General previously has stated, based on his personal dealings with the President, there is no basis to invoke the 25th Amendment, nor was the DAG in a position to consider invoking the 25th Amendment.”

Among former law enforcement officials, the concern is that the mud-slinging between Trump and McCabe will erode public trust even further.

Allegations about Trump’s willingness to meddle in the justice system and about FBI bias are both about to get yet another high-profile airing.

Frank Montoya Jr., a retired FBI special agent whose sympathies lie more with McCabe, told The Hill that the president “has dragged the institution through the mud in a way that I think has damaged its credibility among the general public.”

Montoya added that he was personally frustrated that such efforts could hurt not just the FBI but perceptions of “the rule of law.”

Another former FBI special agent, James Gagliano, cast blame on both sides, however.

Gagliano — who noted that he knew and liked McCabe earlier in his career — said that it was “unequivocally wrong” for the president to “punch down” at FBI officials.

But, referring to the unflattering portrayals of Trump in books by McCabe and Comey, he added: “They have every right to write a book but it solidifies, for about half the country, their view that these people were incapable of being fair arbiters of justice.”

The Trump-McCabe battle seems set to rage anew for some time.

Senate Judiciary Committee Chairman 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.), a Trump ally, told reporters on Thursday that he wanted testimony from Rosenstein — under subpoena if necessary — to find out more about any consideration of deploying the 25th Amendment.

"I imagine if the shoe were on the other foot, my Democratic colleagues would want to know about that conversation if it involved a Democrat. Absolutely, I want to hear from him at the appropriate time,” Graham said.

The Memo is a reported column by Niall Stanage, primarily focused on Donald Trump’s presidency. Morgan Chalfant and Olivia Beavers contributed.