FBI officials enacted a plan to save evidence gathered in the agency's probe of Russia's election interference and the Trump campaign in 2017 after 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's firing of former FBI 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.

A source with knowledge of the discussions at the top of the FBI told The Associated Press that 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, then the deputy FBI director, ordered officials to preserve information obtained as part of the investigation in the event that McCabe or other officials were fired by the president in the wake of Comey's ouster.

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That source told the AP that a plan was created to preserve the evidence after McCabe became acting FBI director, and a second source confirmed to the AP that FBI officials discussed preserving evidence during that time so as to avoid the investigation being stifled by the president's actions.

The report comes after McCabe told "60 Minutes" in an interview over the weekend that he worked to ensure that the Russia probe would endure beyond his possible firing by Trump after his appointment to acting FBI director.

“I was very concerned that I was able to put the Russia case on absolutely solid ground, in an indelible fashion. That were I removed quickly, or reassigned or fired, that the case could not be closed or vanish in the night without a trace," McCabe told CBS News.

“I wanted to make sure that our case was on solid ground and if somebody came in behind me and closed it and tried to walk away from it, they would not be able to do that without creating a record of why they made that decision," he continued.

McCabe added during his interview with CBS that the president "may have committed" a crime by firing Comey, which he suggested could constitute obstruction of justice.

“And the idea is, if the president committed obstruction of justice, fired the director of the FBI to negatively impact or to shut down our investigation of Russia’s malign activity and possibly in support of his campaign, as a counterintelligence investigator you have to ask yourself, “Why would a president of the United States do that?” McCabe told CBS.

Trump has frequently denounced the special counsel investigation headed by Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE as a "witch hunt" tainted by political bias, while the probe has ensnared a number of his former advisers and aides in criminal charges.

In recent weeks, the president has also turned increasing attention to McCabe, who was fired from the FBI after internal watchdogs reported he made an unauthorized disclosure to the news media and "lacked candor — including under oath — on multiple occasions." McCabe, who is promoting a new book called "The Threat: How the FBI Protects America in the Age of Terror and Trump," has sharply denied the claims, saying he was fired to discredit him as a witness.

“The biggest abuse of power and corruption scandal in our history, and it’s much worse than we thought. Andrew McCabe (FBI) admitted to plotting a coup (government overthrow) when he was serving in the FBI, before he was fired for lying & leaking.” @seanhannity @FoxNews Treason! — Donald J. Trump (@realDonaldTrump) February 19, 2019