Appeal to Hypocrisy
Also know as "tu quoque", which translates to “you too” in latin. This appeal is used to quickly end an argument and question the validity of a source rather than the actual statement. It is rather one criticizing someone else's criticism.
“As the only nuclear power to have used a nuclear weapon, the United States has a moral responsibility to act... So today, I state clearly and with conviction America’s commitment to seek the peace and security of a world without nuclear weapons. I’m not naive. This goal will not be reached quickly -- perhaps not in my lifetime. It will take patience and persistence. But now, we, too, must ignore the voices who tell us that the world cannot change. We have to insist, ‘Yes, we can...’”
Now, in 2014, he is changing his decision and reinstating a treaty which will allow nuclear weapons to be utilized as needed.
"How the President Who Pledged to Banish Nuclear Weapons Is Enabling Their Renewal." Truthout. N.p., n.d. Web. 12 Dec. 2014. <http://www.truth-out.org/opinion/item/27950-the-abolition-of-abolition-how-the-president-who-pledged-to-banish-nuclear-weapons-is-enabling-their-renewal>.