Congress is turning up the heat on U.S. Attorney General Eric Holder about his knowledge of the "Fast and Furious" guns scandal.
Rep. Darrell Issa, chairman of the House Oversight Committee, said Sunday he could subpoena officials in the Obama administration as early as this week over weapons lost in the Mexican drug war.
Rep. Issa, R-Calif., suggested on "Fox News Sunday" that Attorney General Eric Holder knew about the gun-trafficking operation -- known as "Fast and Furious" -- earlier than he has acknowledged.
"Why are they denying knowing about something that they were briefed on?" Issa asked. "Exactly when, the American people want to know, how did it happen?"
In the 2009 operation, the Bureau of Alcohol, Tobacco, Firearms and Explosives tried to trace illegal gun smuggling into Mexico by allowing more than 2,000 guns to get into the hands of criminals.
The agency, however, lost track of most of the weapons. A number of the guns were recovered later at crime scenes throughout Mexico.
The firearms were used to kill more than 100 Mexican citizens and two U.S. immigration and border agents.
At a congressional hearing in March, Holder said he hadn't heard of the problem until early 2011. But newly released Justice Department documents, which were sent to the attorney general in July 2010, reference the "Fast and Furious" operation.
"That's just disingenuous on its face," Issa said.
President Obama said he has complete confidence in Holder. But at least one Republican congressman has called for the attorney general to resign.