Andrew McCabe, who became acting director after Comey was sacked, asked investigators to develop a plan to ensure evidence would be protected, said the person, who was not authorized to talk about those discussions publicly and spoke on condition of anonymity to The Associated Press.
"If we failed to open an investigation under [the] circumstances, we wouldn't be doing our jobs", McCabe told CBS News' "60 Minutes" in a much-anticipated interview Sunday night, citing concerns "about a national security threat".
Following the revelations by Andrew McCabe, Republican Senator Lindsey Graham, who is the head of the Senate Judiciary Committee, promised he would hold a hearing on McCabe's comments about a discussion to remove Trump, which he described as an "administrative coup".
During his wide-ranging interview with '60 Minutes, ' Andrew McCabe recounted his final months at the Federal Bureau of Investigation, from the hours after James Comey was sacked to his assertion that President Donald Trump may have an "inappropriate relationship" with Russian Federation. The Justice Department has previously issued a statement from another official in the room who said he interpreted Rosenstein's remark as sarcastic.
In December, CNN reported that following the firing of Comey, McCabe took the extraordinary step of opening an obstruction of justice investigation into Trump before special counsel Robert Mueller was appointed in May 2017.
FBI Director James Comey listens during testimony on Capitol Hill in Washington, March 20, 2017, before the House Intelligence Committee hearing on allegations of Russian interference in the 2016 US presidential election.
Yet McCabe - who was sacked after being charged with misleading investigators and reportedly himself remains under criminal investigation - tells "60 Minutes" that the highest levels in law enforcement were actively plotting on their own how best to force the president from office.
"The reason you would have someone wear a concealed recording device would be to collect evidence. They wouldn't know it was there, '" McCabe added. "I never actually considered him taking him up on the offer".
It was not mentioned in the segment that aired Thursday if McCabe or anyone else approached Cabinet members directly to discuss the idea. "We're not there yet'".
"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".
The statement released by a Justice Department spokesperson late last week again also denied that Rosenstein pursued the 25th Amendment but it did not address whether the topic was raised.
A portion of the interview aired Thursday on "CBS This Morning".