U.S. Attorney General Eric Holder maintains he knew nothing about Operation Fast and Furious, a gun-smuggling investigation by the Justice Department that went wrong.
Holder has been under fire after it was revealed the government lost track of many of the guns meant to catch smugglers in Mexico.
On Thursday, Holder squared off with GOP Rep. Darrell Issa, chairman of the House Oversight and Government Reform Committee.
Issa promised the committee would do what is necessary to force the Justice Department to produce documents necessary for its investigation.
He also threatened to find Holder in contempt of Congress if he did not cooperate.
Issa said Holder has not provided Congress with subpoenaed information about the Justice Departments handling of Operation Fast and Furious. He and other lawmakers think the department is trying to cover its tracks.
"I think you're hiding behind something here," Rep. Dan Burton, R-Ind., told Holder. "You ought to give us the documents. ... It appears we're being stonewalled."
"This has become political, that's fine," Holder said later, adding that this isn't an attempt "at a cover-up."
Holder said he will consider the committee's demands and assured the Justice Department "will continue to share huge amounts of information."
In Fast and Furious, agents lost track of nearly 1,400 of the more than 2,000 guns purchased by suspected smugglers.
Some 700 guns connected to the operation have been recovered in Mexico and the U.S., many at crime scenes.