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As the pressure mounts on Attorney General William Barr to account for his mishandling of Special Counsel Robert Mueller's report on Russian election tampering and obstruction of justice by President Donald Trump, presidential historian Michael Beschloss on Wednesday fired a warning shot at Barr.

In a tweet, Beschloss reminded Barr, and the world, what happened to John Mitchell, Richard Nixon's attorney general, at the apex of the Watergate scandal.

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