NEW : Dennis Burke , the U.S. attorney for Arizona , defended the operation , and appears to have become exasperated at the Justice Department 's cautious response . Eric Holder 's spokeswoman says the new documents raise more questions . Attorney General Grassley is to appear before a committee just days . ATF officials : Documents reflect internal debate about responding to allegations . The Justice is alleged to have let guns be taken illegally into Mexico .
NEW : Eric Holder 's spokeswoman says the new documents raise more questions . Attorney General Grassley is to appear before a committee just days . ATF officials : Documents reflect internal debate about responding to allegations . The Justice is alleged to have let guns be taken illegally into Mexico .