U.S. Secretary of State John Kerry talks with Afghan presidential candidate Abdullah Abdullah at the start of a meeting at the U.S. Embassy in Kabul on Friday. Kerry sought Friday to broker a deal between Afghanistan's rival presidential candidates. Jim Bourg/AP hide caption

itoggle caption Jim Bourg/AP

Supporters of Afghan presidential candidate Abdullah Abdullah rally Friday against alleged fraud in the presidential runoff election. Preliminary results were to be released Tuesday but have been delayed following Abdullah's accusations of widespread fraud. Jawad Jalali /EPA /Landov hide caption

itoggle caption Jawad Jalali /EPA /Landov

A man removes a poster of presidential candidate Ashraf Ghani after the official end of the election campaign. Saturday's runoff election pits Ghani against Abdullah Abdullah. Both have held top government positions and want close ties with the U.S. Ahmad Masood/Reuters/Landov hide caption

itoggle caption Ahmad Masood/Reuters/Landov

Chief Warrant Officer Michael Durant, wounded when the helicopter he was piloting was shot down in Somalia, arrives at Andrews Air Force Base in Maryland, on Oct. 16, 1993. He was held captive for 11 days. Joe Marquette/AP hide caption

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President Obama, Jani Bergdahl and Bob Bergdahl speak during a news conference in the Rose Garden of the White House in Washington on May 31 about the release of their son, U.S. Army Sgt. Bowe Bergdahl. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

U.S. Army Sgt. Bowe Bergdahl watches in July 2009 as one of his captors displays Bergdahl's identity tag during the first of several videos the Taliban released of the soldier. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Sgt. Kyle Gonzales, a sniper with the 82nd Airborne, has a cigarette after a gun battle near the village of Babaker, Giro district, Ghazni province. The soldiers have engaged in gun battles every time they push into the hamlets north of their forward operating base. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Country music singer Brad Paisley performs during a troop rally with President Obama during an unannounced visit at Bagram Air Field on Sunday. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP