The Justice Department is obstructing the congressional investigation of a U.S. law enforcement operation intended to crack down on major weapons traffickers on the Southwest border, according to the embattled leader of the Bureau of Alcohol, Tobacco, Firearms and Explosives.

Ken Melson, the acting director of the ATF, lobbed the accusation when he sneaked in for an interview with congressional investigators on July 4, two days ahead of his scheduled interview with the inspector general about the operation known as “Fast and Furious,” Fox News has learned.

“If his account is accurate, then ATF leadership appears to have been effectively muzzled while the DOJ sent over false denials and buried its head in the sand,” Rep. Darrell Issa, chairman of the Oversight and Government Reform Committee, said in a letter Tuesday to Attorney General Eric Holder. “That approach distorted the truth and obstructed our investigation.”

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