diana alvear outlines this growing dispute. hey, diana. reporter: rob and paula-g morning. i ve seen my share of hearings, and this one by far was one of the nastiest i ve ever seen. members of the congress blast add toernlg eric holder for operation fast and furious. no scandal seemed too controversial to reference. at thursday s contentious capitol hill hearing on operation fast and furious. my question for you is what s the difference between the case of joe paterno at penn state and the justice department under your leadership? reporter: members of the house oversight and government relations committee grilled attorney general eric holder. how many more border patrol agents would have had to die as a part of operation fast and furious for you to take responsibility? that kind of question i think is frankly and again, respectfully, i think that s beneath a member of congress. reporter: the atf s gun-running scheme was supposed to infiltrate and identify hig