The surge of U.S. troops into Afghanistan is ahead of schedule , but the situation on the ground will get more difficult before it gets better , he warned in the prepared remarks . NEW : Obama calls Petraeus from Air Force One . Spokesman says Petraeus fainted , `` is feeling much better '' and will be back in the U.S. shortly. Petraeus was set to testify at Senate Armed Services Committee hearing .
NEW : Obama calls Petraeus from Air Force One . Spokesman says Petraeus fainted , `` is feeling much better '' and will be back in the U.S. shortly. Petraeus was set to testify at Senate Armed Services Committee hearing .