Attorney General Eric Holder faced more tough questions Tuesday about what he knew about the botched guns to Mexico program dubbed 'Fast & Furious' and when.

FOX News Radio's Jared Halpern has more from Capitol Hill:

The nation's top law enforcement officer admits mistakes in Fast and Furious.  An ATF operation meant to track the flow of illegal guns between the U.S. and Mexico.

Holder: "This operation was flawed in its concept and flawed in its execution."

Ranking Republican Charles Grassley calls Fast and Furious a total failure.

Grassley: "I'm eager to hear from the Attorney General who he plans to hold accountable."

House Republicans have subpeonaed documents related to the operation, believing Holder may have mislead Congress during earlier testimony.

On Capitol Hill, Jared Halpern, FOX News Radio.

Listen HERE to highlights of an exchange between Senator John Cornyn (R-TX) and Eric Holder during Tueday's hearing:

Watch VIDEO from the hearing HERE:

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