As part of preparations for the final withdrawal of international combat troops by the end of 2014, Afghanistan's security forces are being pressed into service alone.
Republicans condemn Mr Obama for naming 2014 as a final date for the withdrawal of American combat forces, accusing him of allowing the Taliban to wait patiently for the West to leave.
Bush's visit to Qatar, a staunch U.S. ally that allowed the United States to base troops, weapons and combat equipment there, was his final stop on a weeklong trip.