“We need to get whatever dirt we can on these guys [the whistleblowers] and take them down.”

◼ Issa, Grassley demand answers about Fast and Furious whistleblower retaliation, cover-up - Matthew Boyle/Daily Caller

House oversight committee chairman Rep. Darrell Issa and Iowa Republican Sen. Chuck Grassley are asking the Department of Justice’s internal investigator to hold accountable anyone who retaliated against or threatened to retaliate against Operation Fast and Furious whistleblowers.

In a Friday letter to the DOJ’s Inspector General Michael Horowitz, Grassley and Issa said they’re now concerned retaliation is much more likely following Thursday’s votes to hold Attorney General Eric Holder in criminal and civil contempt of Congress.

“We just learned that ATF senior management placed two of the main whistleblowers who have testified before Congress about Fast and Furious under the supervision of someone who vowed to retaliate against them,” they wrote before describing how senior political figures have made dangerous threats before.

Grassley and Issa said that in early 2011, right around the time Grassley first made public the whistleblowers’ allegations about Fast and Furious, Scot Thomasson – then the chief of the ATF’s Public Affairs Division – said, according to an eyewitness account: “We need to get whatever dirt we can on these guys [the whistleblowers] and take them down.”

Thomasson also allegedly said that: “All these whistleblowers have axes to grind. ATF needs to f—k these guys.”

◼ Obama Contributor, Who Helped Enact Assault-Weapons Ban, Ran ‘Fast and Furious’

It was in July 2010, after his nomination as U.S. attorney, that Burke told the Arizona Capitol Times that he had “been working on homeland security and border enforcement issues” during the transition, and that there had “clearly been direction provided already by President Obama and Attorney General Holder as to what they want to be doing.”