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 said he accepts that Attorney General William BarrWilliam Pelham BarrEx-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' Trump pushes back on impeachment talk: 'Tables are finally turning on the Witch Hunt!' The Hill's Morning Report - Is impeachment back on the table? MORE’s letter to Congress properly characterizes special counsel Robert MuellerRobert (Bob) Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE’s investigation into possible collusion between the Trump campaign and Russia in 2016.

But Comey slammed 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 for not confronting Moscow for its effort to interfere in the election.

“Our executive branch is led by a commander in chief, and a response to an attack on the United States, which is what happened in 2016, requires fundamentally that the commander in chief understand it, recognize it and then direct the branch of government that he leads to anticipate it and prepare to stop it, or retaliate. Our fundamental problem is that I don’t see that our commander in chief acknowledges that it even happened,” Comey said at a Hewlett Foundation conference.

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“So I think we need to start there and ask why our president will not acknowledge what his intelligence community has found overwhelmingly, and I gather once we get the opportunity to see Bob Mueller’s work — I accept that Bill Barr’s letter accurately portrays it — that Bob Mueller found there was a massive effort to interfere in this election.”

Barr reported to Congress last month in a four-page summary that Mueller cleared the Trump campaign of any collusion, but failed reach a conclusion on if the president obstructed justice in any subsequent investigations into the allegations. Barr said he 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 declined to pursue obstruction charges against Trump after reviewing Mueller’s evidence.

Republicans and President Trump touted the report as vindication after the nearly two-year probe, but Democrats pounced on Barr’s obstruction conclusion, saying it should not be up to a Trump appointee to make such a call.

Reports also emerged that members of Mueller’s staff were frustrated with the summary, saying that the evidence they gathered regarding obstruction of justice is more significant than the four-page letter made it seem.

Comey also said that Barr would likely “be one of the rare Trump Cabinet members who will stand up for truth,” but said his recent claim that the FBI was “spying” on the Trump campaign in 2016 “makes it harder” to believe that. 

Comey has emerged as a vocal detractor of Trump’s since he was abruptly fired by the president in 2017.