Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) on Tuesday declared the "case closed" on 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, blasting Democrats for having an "absolute meltdown" over his report.

"What we've seen is a meltdown, an absolute meltdown, an inability to accept the bottom-line conclusion on Russian interference from the special counsel's report," McConnell said from the Senate floor. "My Democratic colleagues seem to be publicly working through the five stages of grief."

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The remarks from McConnell come amid a no holds barred fight between the two parties in Washington over the handling of Mueller's report. Mueller found no evidence of a conspiracy between Russia and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's campaign or organization, but did not reach a conclusion on whether the president obstructed justice.

Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE did reach that conclusion upon reviewing Mueller's report with then-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. Democrats have criticized that finding and are demanding to hear from Mueller. Democrats on the House Judiciary have also scheduled a vote this week to hold Barr in contempt.

McConnell on Tuesday argued that Democrats are angry at Barr for doing his job.

"Baseless accusations of perjury, laughable threats of impeachment. Look, we all know what's going on here. The whole angry barrage the Democrats had prepared to unleash on President Trump except the facts let them down," McConnell said. "They are slandering a distinguished public servant because the real world has disappointed them."

Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) quickly hit back at McConnell, saying he was trying to "whitewash" Mueller's findings and compared his calls to "move on" to "Richard Nixon saying 'let's move on' at the height of the investigation of his wrongdoing."

McConnell said that some on the left had turned Mueller into a "kind of secular saint," and that they appeared to be "grieving" over the findings and should "come back to reality."

"For two years many of the president's opponents seemed to be hoping the worst conspiracy theories were actually true. They seemed to be hoping for a national crisis for the sake of their own politics," McConnell added.

"Russia set out to sow discord, to create chaos in American politics and undermine confidence in our democracy. But on that given the ... fixation on delegitimizing the president, the president Americans chose, and shooting any messenger who tells them inconvenient truths ... I'm afraid the Russians hardly need to lift a finger," McConnell continued.

The floor speech marks the most extensive remarks McConnell, who is up for reelection in 2020 and is aligning himself closely with Trump, has made on the Mueller report.

Updated at 1:22 p.m.