McCabe, Rosenstein opened obstruction probe after Trump fired Comey, before Mueller was hired: report

Former acting FBI Director Andrew McCabeAndrew George McCabeMcCabe: Being accused of treason by Trump 'quite honestly terrifying' Horowitz report is damning for the FBI and unsettling for the rest of us Fox's Chris Wallace: IG report headline is 'It didn't find the things that Bill Barr and Donald Trump alleged' MORE and Deputy Attorney General Rod RosensteinRod RosensteinRosenstein, Sessions discussed firing Comey in late 2016 or early 2017: FBI notes Justice Dept releases another round of summaries from Mueller probe Judge rules former WH counsel McGahn must testify under subpoena MORE opened an obstruction of justice investigation into President TrumpDonald John TrumpThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats worried by Jeremy Corbyn's UK rise amid anti-Semitism Warren, Buttigieg duke it out in sprint to 2020 MORE before special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump MORE's appointment, CNN reported Friday

McCabe took the step to launch the investigation into the president after Trump fired his predecessor, former FBI Director James ComeyJames Brien ComeyInspector general testifies on FBI failures: Five takeaways Horowitz offers troubling picture of FBI's Trump campaign probe GOP senator to FBI: 'Someone's got to be fired' MORE, in May 2017, two sources told the cable news outlet.

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The FBI’s justification for the probe reportedly included Trump’s reported conversation with Comey in the Oval Office where he asked for an investigation into former national security adviser Michael Flynn to be dropped. 

The Washington Post first reported last year the launch of an obstruction investigation, but sources elaborated to CNN how top law enforcement officials were frantic after Comey was fired.

They were reportedly concerned about Trump’s behavior and considered him a leader who might need to be reined in, sources told CNN.

Officials reportedly tossed around various ideas about how to handle the investigation, including a discussion about Rosenstein wearing a wire to talk to Trump, a report which Rosenstein later denied.

A source within the Justice Department rejected the notion that Rosenstein tried to curb Trump, telling CNN that he "never said anything like that."

A spokeswoman for McCabe did not prove a comment to the network.

McCabe and Rosenstein, on the day that the special counsel was appointed, briefed the Gang of Eight Republican and Democratic congressional leaders and the heads of each intelligence committee.

Mueller was appointed just eight days after Comey's firing to investigate alleged Russian interference in the 2016 election and potential collusion between the Trump campaign and Moscow.

The president and his allies have frequently railed against the special counsel investigation and the officials who launched it, calling it a "witch hunt." 

McCabe was fired from the FBI in March and Trump tweeted a picture showing Rosenstein behind bars just last week.

"It's shocking that the FBI would open up an obstruction case for the President exercising his authority under Article II," Trump’s attorney Rudy Giuliani told the outlet.