Veteran Watergate journalist Carl Bernstein on Friday accused Republicans of trying to discredit 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, condemning a criminal referral for the author of a controversial dossier on President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

In an interview with CNN, Bernstein said that Republican senators' move to request a criminal investigation of former British intelligence operative Christopher Steele was a "glowing red herring." Steele was behind research included in the dossier of unverified claims linking Trump to Russia.

“It’s not just a distraction or a red herring, it’s a glowing red herring in the Washington swamp,” Bernstein said.

Bernstein argued that a letter sent from Sens. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans signal openness to working with Biden Senators offer disaster tax relief bill Trump spikes political football with return of Big Ten season MORE (R-Iowa) and Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) to the Justice Department asking 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 to investigate whether Steele lied to investigators about his contacts with journalists was another "distraction" to shift attention away from the Mueller probe and the Trump administration.

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The two senators said they believe Steele lied to investigators during the course of the investigation into the dossier. Some of the claims in the dossier have been proven true with public evidence, while others remain unverified.

"It is such a sideshow," Bernstein continued. "It's another attempt to discredit the Mueller investigation. And why on Earth we cannot allow, and why the members of the Congress of the United States to continue so that we can find out what has happened here ... there's plenty of time when Mueller is finished to look at all these sideshows. That's the time to do it. But let's get on with this investigation."

Grassley, who chairs the powerful Senate Judiciary Committee, said Friday in a statement that he does not take such investigations "lightly."

"I don’t take lightly making a referral for criminal investigation. But, as I would with any credible evidence of a crime unearthed in the course of our investigations, I feel obliged to pass that information along to the Justice Department for appropriate review,” Grassley said.

Democrats on the panel, including ranking member Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.), torched the letter, however, calling it an attempt to "deflect attention."

"I think this referral is unfortunate as it’s clearly another effort to deflect attention from what should be the committee’s top priority: determining whether there was collusion between the Trump campaign and Russia to influence the election and whether there was subsequent obstruction of justice," she said.