How the U.S. military is supporting Iraq against ISIS

Secretary of Defense Ash Carter announced Monday that the U.S. will be sending 217 more soldiers into Iraq, bringing total American strength there over 4,000. The news comes as Iraqi forces begin their advance on the Islamic State-held city of Mosul, a campaign supported and funded by the U.S. Judy Woodruff talks to presidential envoy Brett McGurk for more on the struggle to drive ISIS from Iraq.