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Mr. Issa this week also asked Ronald Weich, assistant attorney general for legislative affairs, to explain who prepared or helped prepare a Feb. 4 letter he sent to Mr. Grassley denying that guns had been walked into Mexico as part of Fast and Furious.

He said the congressional investigation of the operation has shown that the statement was untrue, and that senior Justice Department officials knew at the time Mr. Weich made the denial that it was untrue.