`` Operation Fast and Furious '' let hundreds of guns reach Mexico , investigators say . Comment: The committee 's ranking Republican , Iowa Sen. Chuck Grassley , is a leading critic of the probe . The botched ATF probe is a `` black eye '' for the Justice Department , former official says . But the controversy is not likely to become a major scandal , analyst tells CNN .
`` Operation Fast and Furious '' let hundreds of guns reach Mexico , investigators say . Comment: The botched ATF probe is a `` black eye '' for the Justice Department , former official says . But the controversy is not likely to become a major scandal , analyst tells CNN .