The Justice Department's inspector general is probing whether two federal agents could face retaliation for blowing the whistle on operation "Fast and Furious."In a letter to Sen. Chuck Grassley (R-Iowa) and Rep. Darrell Issa (R-Calif.), made public on Monday, IG Michael Horowitz said he was investigating their concerns that two federal officials could be at risk of retaliatory action for speaking out against the botched gun tracking operation.

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