Mark Penn, a supporter of the Clinton campaign, as he responds to questions in the

As a former chief pollster and campaign strategist for Bill and Hillary Clinton[1], Mark Penn[2] has a long history of railing against special prosecutors and political investigations of the president.

But even though it’s 2018 and the partisan shoe is on the other foot, Mr. Penn[3] hasn’t changed.

In some ways, he’s even harder-line now, publicly turning against the Clintons and accusing Robert S. Mueller of engaging in a “deep-state” quasi-coup on their behalf.

Mr. Penn[4] has had numerous recent appearances on Fox News and other conservative outlets, essentially supporting President Trump’s claims about Mr. Mueller seeking to “bring down” the president using “storm trooper tactics.”

In a column posted[5] Sunday evening on The Hill, he said the “scorched-earth effort … must now be stopped, preferably long before a vote in the Senate.”

He noted that “its prosecutions have all been principally to pressure witnesses with unrelated charges and threats to family, or just for a public relations effect, like the indictment of Russian internet trolls.”

He then made the explicit comparison with the Ken Starr investigation of the Whitewater real-estate deal, which eventually metastasized into the Monica Lewinsky probe.

“Unfortunately, just like the Doomsday Machine in ‘Dr. Strangelove’ that was supposed to save the world but instead destroys it, the Mueller investigation comes with no ‘off’ switch: You can’t fire Mueller. He needs to be defeated, like Ken Starr, the independent counsel who investigated President Clinton[6],” Mr. Penn[7] wrote.

He spoke similarly in an appearance on Fox News in early May, cited by[8] the New York Times, saying he had “spent a year working with President Clinton[9] against Ken Starr and that effort … that was child’s play to what’s going on here.”...

The former Clinton[10] campaign chief also went beyond criticizing an unaccountable prosecutor broadening his scope just to get … something, anything — that’s an argument being made by some of the other longtime liberal critics of special-counsel, such as Harvard law professor Alan Dershowitz.But unlike Mr. Dershowitz, Mr. Penn[11] also largely endorsed much of Mr. Trump’s “Crooked Hillary” and “deep state” narratives, even using the latter term himself.He said the “highest echelons of the FBI and the Justice Department broke their own rules to end the Hillary Clinton ‘matter,’” sarcastically using that last word, reportedly preferred by then Attorney General Loretta Lynch so as not to even imply Mrs. Clinton[12] might have committed a crime in her use of a private email account and server.Mr. Penn[13] also poured scorn on Ms. Lynch, who met Mr. Clinton[14] privately as the email probe was wrapping up — she said to discuss grandchildren and other mundane matters.“It is hard to see how a yearlong investigation of this

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