President Obama calls Afghan leader to discuss security agreement . Karzai says he will sign the deal if U.S. and NATO troops leave by 2014. Afghan President Karzai refuses to sign a deal to keep some troops there . The White House says an agreement could happen after Karzai leaves office in April .
President Obama calls Afghan leader to discuss security agreement . Obama orders planning for bringing home all U.S. troops at the end of 2014 . Afghan President Karzai refuses to sign a deal to keep some troops there . The White House says an agreement could happen after Karzai leaves office in April .