US President Barack Obama told his Afghan counterpart Hamid Karzai on Tuesday he is now planning a full US troop withdrawal, but did not rule out a deal on a post-2014 mission with the next Kabul government.

US President Barack Obama told his Afghan counterpart Hamid Karzai on Tuesday he is now planning a full US troop withdrawal, but did not rule out a deal on a post-2014 mission with the next Kabul government.

Obama told Karzai by telephone that, since the Afghan leader had refused to sign a Bilateral Security Agreement (BSA) with Washington, the Pentagon has little option but to plan for a full pullout, the White House said.

"President Obama told President Karzai that because he has demonstrated that it is unlikely that he will sign the BSA, the United States is moving forward with additional contingency planning," the statement said.

"Specifically, President Obama has asked the Pentagon to ensure that it has adequate plans in place to accomplish an orderly withdrawal by the end of the year should the United States not keep any troops in Afghanistan after 2014."