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 .
NEW : Grassley 's spokeswoman says the new documents raise more questions . Attorney General Eric Holder is to appear before a committee next week . Justice officials : Documents reflect internal debate about responding to allegations . The ATF is alleged to have let guns be taken illegally into Mexico .