Saudi Arabia became the second key American ally in the Middle East to demand President Barack Obama change tack towards Iran on Thursday, as it called for US-led coalition "boots on the ground" because outside Kurdish areas the offensive against ISIS is heavily influenced by Iran and its proxy Shia militias such as Hizbollah.
http://www.telegraph.co.uk/news/worldnews/middleeast/iran/11453242/Iran-is-taking-over-Iraq-and-Obama-must-put-boots-on-the-ground-against-Isil-warns-Saudi-Arabia.html