Petraeus on why U.S. needs to stay in Afghanistan

The Trump administration is reportedly considering sending 4,000 more U.S. troops to Afghanistan in light of a deteriorating security situation. Retired Gen. David Petraeus joins Judy Woodruff to discuss the need for a long-term U.S. military commitment in that country, civilian casualties in the coalition fight against the Islamic State, the American policy on the crisis facing Qatar and more.