Top U.S officials have begun working to build support for the Afghan troop surge a day after President Barack Obama set out his new strategy. Joint Chiefs of Staff head Adm Mike Mullen said the surge would provide forces to turn this thing around. Defense Secretary Robert Gates warned that failure to act against the resurgent Taliban would have severe consequences for the United States and the world. NATO leaders are due to meet with the issue of more troops top of the agenda.Mr Obama announced on Tuesday that he was sending 30,000 more US troops to fight in Afghanistan, taking the total number of US soldiers there to more than one lakh.