There’s never been much love lost between Attorney General Eric Holder and Republican Rep. Darrell Issa of California – who heads the House Oversight and Government Reform Committee.

Upset by a line of questioning, US Attorney General Eric Holder tells Rep. Darrell Issa that his conduct as a member of Congress is "unacceptable and shameful."

The tension between the two men was on full display Wednesday, when Holder flatly labeled Issa’s conduct during a hearing of the House Judiciary Committee “shameful.”

The charge came after an aggressive exchange about Labor Secretary nominee Tom Perez, whom Republicans say acted inappropriately during his time at the Justice Department.

“I am not going to stop talking now," Holder countered as Issa objected to the attorney general’s attempts to interject.

"It is inappropriate and too consistent with the way in which you conduct yourself as a member of Congress," Holder said. "It is unacceptable. It is shameful."

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