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

Former acting FBI Director Andrew McCabeAndrew George McCabeThe Mueller report concludes it was not needed Ten post-Mueller questions that could turn the tables on Russia collusion investigators Electronic surveillance isn't spying — it's much more powerful MORE and Deputy Attorney General Rod RosensteinRod Jay RosensteinEx-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' Mueller questioned by TV journalist over details of report Cummings: Barr acting like 'defense counsel' for Trump rather than AG MORE opened an obstruction of justice investigation into President TrumpDonald John TrumpTrump calls Sri Lankan prime minister following church bombings Ex-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' The biggest challenge from the Mueller Report depends on the vigilance of everyone MORE before special counsel Robert MuellerRobert (Bob) Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 Comey'Morning Joe' hosts suggest media should boycott White House aides 'who repeatedly lie' 10 factors making Russia election interference the most enduring scandal of the Obama era Trump takes aim at Dem talk of impeachment 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.