House oversight committee Chairman Darrell Issa and Iowa Republican Sen. Chuck Grassley sent Holder a letter in May 2011 asking for details about Operation Fast and Furious, the ATF operation that sent thousands of guns to Mexican drug cartels. Tax money may have been used to purchase the guns. Grassley and Issa, "have urged Holder to cooperate and turn over subpoenaed records that would reveal the scope of the government coverup." In October 2011, documents were released that indicated Holder was sent memos in regards to Operation Fast and Furious in 2010, contradicting Holder's sworn testimony before the House Judiciary Committee in which he said he was unaware of Operation Fast and Furious until April 2011.



