U.S. says may pull out all troops as Afghan leader holds up deal

Afghanistan's President Hamid Karzai has refused to sign a security deal with the United States, the White House said, and Washington may have to resort to the "zero option" of withdrawing all American troops from the strife-torn country next year, as it did in Iraq.

http://www.thestar.com.my/News/World/2013/11/26/Afghanistans-Karzai-outlines-conditions-for-US-security-deal.aspx