 A second letter from Grassley on January 31 accused the ATF of targeting whistleblowers.On February 4, 2011, after review and comment from dozens of officials in the Justice Department Criminal Division, the Office of the Deputy Attorney General, the U.S. Attorney's Office in Phoenix, and ATF Headquarters, Assistant Attorney General Ronald Weich sent a response to Grassley regarding his two letters.Weich said claims "...that (the) ATF ‘sanctioned’ or otherwise knowingly allowed the sale of assault weapons to a straw purchaser who then transported them to Mexico [are] false.