Sen. Chuck Grassley, Iowa Republican, said the possibility exists that Justice Department officials were aware of a memo from an ATF agent in Phoenix on Feb. 3 and still sent its erroneous denial letter Feb. 4. The latter was later disavowed. (Associated Press)

Sen. Chuck Grassley, Iowa Republican, said the possibility exists that Justice Department officials were aware of a memo from an ATF agent in Phoenix on Feb. 3 and still sent its erroneous denial letter Feb. 4. The latter was later disavowed. (Associated Press)