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Afghan Ministry of Foreign Affairs Acting Chief of Protocol Hamid Siddiq, center, walks with U.S. Ambassador to Afghanistan James Cunningham, left, and U.S. Secretary of State John Kerry, right, as Kerry arrives for a second meeting with Afghan President Hamid Karzai at the presidential palace in Kabul, Afghanistan, Saturday, Oct. 12, 2013. The future of U.S. involvement in Afghanistan after the last troops leave at the end of 2014 may depend on whether U.S. officials like Kerry can allay Karzai's worries about sovereignty, Pakistan and the safety of Afghan citizens at the hands of Western troops. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry )

Afghan President Hamid Karzai, second from left, walks with U.S. Secretary of State John Kerry at the Presidential Palace during Kerry's unannounced stop to meet wit Karzai in Kabul, Afghanistan, on Friday, Oct. 11, 2013. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

Afghan honor guard soldiers hold straight a U.S. and Afghan flag in preparation for an expected and delayed news conference between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the Presidential Palace during an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan US Kerry )

U.S. Secretary of State John Kerry, left, meets with Afghan President Hamid Karzai at the Presidential Palace during an unannounced stop in Kabul, Afghanistan, Friday, Oct. 11, 2013. Kerry flew to Afghanistan Friday for urgent talks with Afghan President Hamid Karzai as an end of October deadline looms for completing a security deal that would allow American troops to remain in Afghanistan after the end of the NATO-led military mission next year. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry )

U.S. Secretary of State John Kerry paces while talking on his mobile phone from the second story of the Afghan Presidential Palace during a break in an extended meeting with Afghan President Hamid Karzai at the palace during an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan US Kerry )

The Black Hawk helicopter transporting US Secretary of State, John Kerry flies above the ISAF Headquarters after Kerry's arrival for an unannounced meeting with Afghan President Hamid Karzai in Kabul on October 11, 2013. US Secretary of State John Kerry arrived on an unannounced visit to Kabul to try to advance troubled negotiations with Afghanistan on some US troops staying in the country after 2014. JACQUELYN MARTIN/AFP/Getty Images ( 523702197 )

U.S. Secretary of State John Kerry, center, enters the ISAF headquarters after arriving on an unannounced visit in Kabul, Afghanistan, Friday, Oct. 11, 2013. Kerry flew to Afghanistan Friday for urgent talks with Afghan President Hamid Karzai as an end of October deadline looms for completing a security deal that would allow American troops to remain in Afghanistan after the end of the NATO-led military mission next year. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry )

U.S. Secretary of State John Kerry, center, speaks to U.S. Embassy staff during a break in an extended meeting with Afghan President Hamid Karzai on the second day of an unannounced visit in Kabul, Afghanistan, on Saturday, Oct. 12, 2013. Kerry extended talks Saturday with Karzai on a bilateral security agreement with the United States, and while work remains to be done a deal could be struck by the end of the day, a presidential spokesman said. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

U.S. Secretary of State John Kerry gestures with his fist while speaking to U.S. Embassy staff during a break in an extended meeting with Afghan President Hamid Karzai in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, on the second day of an unannounced visit as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

U.S. Secretary of State John Kerry arrives for a visit with U.S. Embassy staff during a break in an extended meeting with Afghan President Hamid Karzai in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, on the second of an unannounced visit as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

Hamid Siddiq, Afghan Ministry of Foreign Affairs Acting Chief of Protocol, left, walks with U.S. Secretary of State John Kerry, as Kerry arrives for a second meeting with Afghan President Hamid Karzai at the presidential palace in Kabul, Afghanistan, Saturday, Oct. 12, 2013. The future of U.S. involvement in Afghanistan after the last troops leave at the end of 2014 may depend on whether U.S. officials like Kerry can allay Karzai's worries about sovereignty, Pakistan and the safety of Afghan citizens at the hands of Western troops. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry )

An Afghan soldier rests as a news conference is delayed between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the presidential palace on the second day of an unannounced stop in Kabul, Afghanistan, Saturday, Oct. 12, 2013. Kerry extended talks Saturday with Karzai on a bilateral security agreement with the United States, and while work remains to be done a deal could be struck by the end of the day, a presidential spokesman said. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

A worker walks past Afghan guards as they wait for a news conference that has been delayed between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the presidential palace on the second day of an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013. Kerry extended talks Saturday with Karzai on a bilateral security agreement with the United States, and while work remains to be done a deal could be struck by the end of the day, a presidential spokesman said. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry US )

Adela Raz, Afghan President Karzai's deputy spokesman, left, speaks with an Afghan woman journalist as they wait for an expected and delayed news conference between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the Presidential Palace, during Kerry's unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan US Kerry )

An employee of the Afghan Presidential Palace clears leaves from the site where U.S. Secretary of State John Kerry and Afghan President Hamid Karzai are expected to speak at a delayed news conference at the palace in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. Karzai and Kerry had a second meeting together at the Presidential Palace during Kerry's unannounced visit. The news conference was delayed for extended meetings between the Secretary and President. (AP Photo/Jacquelyn Martin, Pool) ( APTOPIX Afghanistan US Kerry )

U.S. Secretary of State John Kerry shakes hands with Afghan President Hamid Karzai after they made remarks during a news conference at the Presidential Palace during an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( APTOPIX Afghanistan US Kerry )

U.S. Secretary of State John Kerry, left, leans in toward Afghan President Hamid Karzai as they say goodbye at the end of a news conference announcing a tentative agreement between the two countries at the Presidential Palace during Kerry's unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan US Kerry )

Afghan President Hamid Karzai, right, points toward U.S. Secretary of State John Kerry as he jokes with him at the start of a news conference at the Presidential Palace during Kerry's unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013, as a deadline approaches for a security deal about the future of U.S. troops in the country. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan US Kerry )

U.S. Secretary of State John Kerry looks out the window en route to the ISAF headquarters after arriving on an unannounced visit in Kabul, Afghanistan, Friday, Oct. 11, 2013. Kerry flew to Afghanistan Friday for urgent talks with Afghan President Hamid Karzai as an end of October deadline looms for completing a security deal that would allow American troops to remain in Afghanistan after the end of the NATO-led military mission next year. (AP Photo/Jacquelyn Martin, Pool) ( Afghanistan Kerry )

Afghan security forces inspect the site of a suicide attack in Jalalabad on October 12, 2013. A suicide bomber killed two policemen when he slammed an explosives-laden car into a police headquarters in east Afghanistan, underlining the country's instability as US Secretary of State John Kerry visited Kabul. OMAR GUL/AFP/Getty Images ( 523723410 )

Afghan security forces inspect the site of a suicide attack in Jalalabad on October 12, 2013. A suicide bomber killed two policemen when he slammed an explosives-laden car into a police headquarters in east Afghanistan, underlining the country's instability as US Secretary of State John Kerry visited Kabul. OMAR GUL/AFP/Getty Images ( 523723951 )

A member of the Afghan security forces carries a piece of mangled wreckage at the site of a suicide attack in Jalalabad on October 12, 2013. A suicide bomber killed two policemen when he slammed an explosives-laden car into a police headquarters in east Afghanistan, underlining the country's instability as US Secretary of State John Kerry visited Kabul. OMAR GUL/AFP/Getty Images ( 523723234 )