The House Oversight and Government Reform Committee is planning to subpoena Attorney General Eric Holder this week to determine who in the Justice Department knew about “Operation Fast and Furious” — the plan to let thousands of guns sold in the U.S. get into Mexican drug cartel hands — and when they knew it.

The subpoena targeting Holder aims to get at the heart of the authorization for the program, and when the people in charge decided the program was a problem.

“When did they know it wasn’t the right way to do it and why (did) they keep doing it?” asked committee chairman, Rep. Darrell Issa, R-Calif.

Issa, who is also a member of the House Judiciary Committee where Holder testified in May that he’d only learned of the program a few weeks earlier, told “Fox News Sunday” that “people in the top” of the Justice Department knew about the operation, were “well-briefed about it, and seemed to be the command and control and funding for this program.”