NEW : Chicago ATF field office head set to meet with attorney general about job , sources say . Comment: The ATF operation allowed illegal gun purchases . Some weapons ended up reportedly in the hands of Mexican cartels .
NEW : Chicago ATF field office head set to meet with attorney general about job , sources say . The sources say the ATF acting director 's resignation could occur in the coming days . The ATF operation allowed illegal gun purchases . Some weapons ended up reportedly in the hands of Mexican cartels .