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 said he accepts that Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE’s letter to Congress properly characterizes special counsel 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’s investigation into possible collusion between the Trump campaign and Russia in 2016.

But Comey slammed 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 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 Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book 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.