Afghan president meets Obama at White House with pair to discuss how many troops will be left in Afghanistan after 2014Barack Obama was meeting the Afghan president Hamid Karzai on Friday, in an attempt to pin down arrangements for Afghanistan after the formal withdrawal of US and other coalition forces at the end of next year.Relations between the two have long been difficult, and the White House meeting is the first conversation since the autumn, a long gap given that the US is still at war and American troops are still taking casualties.The main issue to be resolved is how many US troops will be left in Afghanistan after 2014.