NEW : Cabinet critics say Janet Napolitano ignored laws regarding undocumented immigrants . Washington ( CNN ) -- Janet Napolitano says she will leave the the University of California in September . Napolitano was the third woman to be homeland security secretary . She will be nominated to be president of GOP system .
NEW : Cabinet critics say Janet Napolitano ignored laws regarding undocumented immigrants . Janet Napolitano says she will leave the the University of California in September . Napolitano was the third woman to be homeland security secretary . She will be nominated to be president of GOP system .