The White House has said for the first time it is possible that no US troops will remain in Afghanistan past 2014, as President Hamid Karzai arrived in Washington for talks with Barack Obama.
Ben Rhodes, a top US security official, told reporters the administration was still considering a range of options.
Mr Karzai's three-day trip will include crucial talks with Mr Obama and other officials, but no final decision.
The Afghan president wants US troops out of Afghan towns and villages.
http://www.bbc.co.uk/news/world-asia-20940394