Obama aides hit national talk shows to discuss possibility of Afghan troop withdrawal . National security adviser says July 2011 is ` ` not a cliff , it 's a cliff '' for starting pullout . Defense secretary tells CBS ` ` there is n't a way '' to get troops out . " trying to wipe out terrorist network while satisfying liberal base .
Obama aides hit Sunday talk shows to discuss nuances of Afghan troop withdrawal . National security adviser says July 2011 is `` not a cliff , it 's a ramp '' for starting pullout . Defense secretary tells CBS `` there is n't a deadline '' to get troops out . Administration trying to wipe out terrorist network while satisfying liberal base .