U.S. Defense Secretary Chuck Hagel speaks to members of the U.S. Army 101st Airborne Airborne Division during his visit to Jalalabad Airfield in eastern Afghanistan, Saturday, March 9, 2013. It is Hagel's first official trip since being sworn-in as President Barack Obama's defense secretary. (AP Photo/Jason Reed, Pool)
FILE - In this March 4, 2013 file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London. Bieber is recovering after fainting backstage at a concert in London on Thursday, March 7, 2013. A spokeswoman for Bieber said that the 19-year-old pop star was given oxygen and took a 20-minute reprieve after fainting backstage at his show at London's O2 Arena. (Photo by Joel Ryan/Invision/AP, File)
U.S. Defense Secretary Chuck Hagel speaks to members of the U.S. Army 101st Airborne Division at Jalalabad Airfield in eastern Afghanistan, Saturday, March 9, 2013. It is Hagel's first official trip since being sworn-in as President Barack Obama's defense secretary. (AP Photo/Jason Reed, Pool)
U.S. Defense Secretary Chuck Hagel poses for a picture with a member of the U.S. Army 101st Airborne Division during his visit to Jalalabad Airfield in eastern Afghanistan, Saturday, March 9, 2013. It is Hagel's first official trip since being sworn-in as President Barack Obama's defense secretary. (AP Photo/Jason Reed, Pool)
U.S. Defense Secretary Chuck Hagel participates in the awarding of a Purple Heart to Sgt. Jeremyah Williams of the 426 Brigade Support Battalion, at Jalalabad Airfield in eastern Afghanistan, Saturday, March 9, 2013. It is Hagel's first official trip since being sworn-in as President Barack Obama's defense secretary. (AP Photo/Jason Reed, Pool)
Ambulances arrive outside the Afghan Defense Ministry after a suicide bomber on a bicycle struck outside the ministry, killing at least nine Afghan civilians as U.S. Defense Secretary Chuck Hagel visited Kabul, Afghanistan, Saturday, March 9, 2013. (AP Photo/Anja Niedringhaus)
Afghan Army soldiers take position at the gate of the Afghan Defense Ministry after a suicide bomber on a bicycle struck outside the ministry, killing at least nine Afghan civilians as U.S. Defense Secretary Chuck Hagel visited Kabul, Afghanistan, Saturday, March 9, 2013. (AP Photo/Anja Niedringhaus)
KABUL, Afghanistan — Two suicide bombings and a host of looming disagreements with the Afghan president cast a shadow on Saturday over U.S. Defense Secretary Chuck Hagel’s first visit to Afghanistan since taking the post. Nineteen Afghans were killed — including eight children — in …