Giddy up.

(The Hill) — Rep. Darrell Issa (R-Calif.) has requested a briefing with the Justice Department over a news report that U.S. law enforcement officials helped Mexican drug cartels launder millions of dollars into the country.

The chairman of the House Oversight and Government Reform Committee made the request in a letter to Attorney General Eric Holder, in which he questioned DOJ head’s ability to lead the agency.

Issa has been investigating the DOJ’s authorization of a botched gun-tracking operation for most of the year and has increasingly criticized Holder, who is set to appear before the House Judiciary Committee on Thursday.

“The existence of such a program again calls your leadership into question,” said Issa in his letter. “The managerial structure you have implemented lacks appropriate operational safeguards to prevent the implementation of such dangerous schemes. The consequences have been disastrous.”

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