At U.N. , Obama stressed the need for diplomacy to solve international problems . But he said , regarding Iran , that time for ' ` ` is not unlimited '' ' : Hope and optimism . U.S. ` ` will do what we can '' to prevent Iran from obtaining a nuclear weapon . President describes expansive anti - human trafficking plan at Clinton Global Initiative ##s .
At U.N. , Obama stressed the need for diplomacy to solve international problems . But he said , regarding Iran , that time for ' ` ` is not unlimited '' ' : U.S. ` ` will do what we can '' to prevent Iran from obtaining a nuclear weapon . President describes expansive anti - human trafficking plan at Clinton Global Initiative ##s .