Attorney General Jeff Sessions is reviewing a recommendation to fire the former F.B.I. deputy director, Andrew G. McCabe, just days before he is scheduled to retire on Sunday, people briefed on the matter said. Mr. McCabe was a frequent target of attack from President Trump, who taunted him both publicly and privately.

Mr. McCabe is ensnared in an internal review that includes an examination of his decision in 2016 to allow F.B.I. officials to speak with reporters about an investigation into the Clinton Foundation. The Justice Department’s inspector general concluded that Mr. McCabe was not forthcoming during the review, according to the people briefed on the matter. That yet-to-be-released report triggered an F.B.I. disciplinary process that recommended his termination — leaving Mr. Sessions to either accept or reverse that decision.

Lack of candor is a fireable offense, but like so much at the F.B.I., Mr. McCabe’s fate is also entangled in presidential politics and the special counsel investigation. He was involved from the beginning in the investigation into the Trump campaign’s ties to Russia. He is also a potential witness in the inquiry into whether Mr. Trump tried to obstruct justice.

Mr. Trump’s supporters have tried to cast Mr. McCabe as part of a “deep state” that operates in secret to undermine the administration. Mr. Trump has goaded Mr. Sessions into taking action against him.

Why didn’t A.G. Sessions replace Acting FBI Director Andrew McCabe, a Comey friend who was in charge of Clinton investigation but got….

Now, Mr. Sessions is the final arbiter of Mr. McCabe’s dismissal, shortly before his retirement takes effect Sunday. Though no decision has been made, people inside the Justice Department expect him to be fired before Friday, a decision that would jeopardize his pension as a 21-year F.B.I. veteran.

FBI Deputy Director Andrew McCabe is racing the clock to retire with full benefits. 90 days to go?!!!

Pensions are set through a formula based on past salaries and years of service. The value of Mr. McCabe’s pension, and how much might be in jeopardy, was not immediately clear.

Under F.B.I. rules, internal reports are referred to the bureau’s Office of Professional Responsibility, which makes disciplinary recommendations. Mr. McCabe can appeal that recommendation to the attorney general. A Justice Department spokeswoman declined to say whether Mr. McCabe would be fired.

“The department follows a prescribed process by which an employee may be terminated,” said the spokeswoman, Sarah Isgur Flores. “That process includes recommendations from career employees, and no termination decision is final until the conclusion of that process. We have no personnel announcements at this time.”

Mr. McCabe declined to comment. His friends and allies have said that he denies any wrongdoing in his dealings with journalists or the inspector general. He stepped down in January and took a leave of absence under pressure over the looming inspector general’s report.

Mr. McCabe is a career agent, not a political appointee, so Mr. Trump has no direct say in his fate. The decision nonetheless comes at a moment of turnover in Mr. Trump’s national security team. On Tuesday, the president fired the secretary of state, Rex W. Tillerson, and named the C.I.A. director, Mike Pompeo, to replace him. He tapped a veteran clandestine officer, Gina Haspel, to lead the C.I.A.

Firing Mr. McCabe, even on the recommendation of the disciplinary office, would be controversial. Among Mr. McCabe’s allies, the decision would raise the specter that Mr. Sessions was influenced by Mr. Trump’s frequent derisive comments. No deputy director in the history of the F.B.I. has been fired.

But Mr. Sessions would be able to point to a critical inspector general’s report and say he followed Justice Department protocol. The details of why the inspector general viewed Mr. McCabe as not forthcoming are not clear. Though F.B.I. disciplinary records show that drunken driving, domestic violence and assaults have been punished by suspension, when agents are found to have shown a lack of candor under oath, they are commonly fired.

The inspector general, Michael Horowitz, announced last year that he would investigate several contentious decisions made at the F.B.I. and Justice Department during the 2016 presidential campaign. In November, Mr. Horowitz indicated that he planned to issue a single report this spring encompassing his entire review, on matters including the F.B.I.’s investigation of Hillary Clinton’s use of a private email server.

There are no indications that Mr. Horowitz is prepared to release a broad report this week. It is not clear why he opted to handle Mr. McCabe separately and refer him for discipline before the release of the full report. A spokesman for Mr. Horowitz has declined to comment.

Mr. Trump has attacked members of the F.B.I. and the Justice Department for much of his first year in office. But few have been the target of presidential ire like Mr. McCabe. Mr. Trump has repeatedly remarked on the fact that Mr. McCabe’s wife, Jill, ran as a Democrat for a State Senate seat in Virginia. Her campaign received hundreds of thousands of dollars in donations from a political committee run by Terry McAuliffe, the Virginia governor at the time and a longtime ally of the Clintons.

Mrs. McCabe lost the race and Mr. McCabe was later promoted to deputy director, where he oversaw the investigation into Mrs. Clinton. No charges were filed in that case, and Mr. Trump has pointed to the donations to Mr. McCabe’s wife’s campaign as evidence of F.B.I. bias.

Problem is that the acting head of the FBI & the person in charge of the Hillary investigation, Andrew McCabe, got $700,000 from H for wife!

In meetings with Mr. McCabe, the president questioned how he had voted and needled him about his wife, calling her a “loser,” according to people familiar with the conversations.

The precise allegations against Mr. McCabe will not be clear until the full report is released. But what is publicly known does not fit neatly into Mr. Trump’s theory of Mr. McCabe as a Democratic operator. Mr. McCabe has described himself to friends as a lifelong Republican voter.

The allegations revolve around disclosures to The Wall Street Journal, which revealed in October 2016 a dispute between the F.B.I. and Justice Department over how to proceed in an investigation into the Clinton family’s foundation. The article said that the Justice Department would not authorize subpoenas in the case. Some F.B.I. agents, the article said, believed that Mr. McCabe had put the brakes on the investigation. Others rejected that notion.

The inspector general has concluded that Mr. McCabe authorized F.B.I. officials to provide information for that article. The public affairs office arranged a phone call to discuss the case, a common practice in the federal government when officials believe that a journalist has only part of the story.

In the Journal story, a person described as close to Mr. McCabe pushed back on the notion that he had tried to shut down the Clinton Foundation investigation. To the contrary, the person described a tense conversation with the Justice Department in which Mr. McCabe insisted his agents had the authority to keep investigating.

The article was a negative one for the Clinton campaign — not Mr. Trump. It was published just days before the election, after the F.B.I. reopened its investigation into Mrs. Clinton’s email practices. The article, including the F.B.I. disclosures, made it clear that some agents saw evidence of wrongdoing by the Clinton Foundation that was worth investigating.

Mr. McCabe joined the F.B.I. after law school and rose quickly through the ranks. Under the former F.B.I. director, James B. Comey, he ascended through several senior leadership jobs, and it was clear that he was being groomed for the bureau’s No. 2 position. His rise angered some rank-and-file agents. But supporters viewed him as a sophisticated, intellectual choice for a job that has become an integral part of the nation’s intelligence community.

The deputy director is the chief operations officer at the F.B.I., a job that requires managing relationships with the White House and Congress. That task became unusually difficult as agents investigated the Trump campaign, straining relationships with Mr. Trump. Democrats in Congress, meanwhile, criticized the F.B.I. for failing to do enough in that inquiry, while Republicans accused agents of drumming up an investigation based on shoddy evidence.