The President of the United States has sole nuclear launch authority. To stop him would either take the cabinet and VP invoking the 25th amendment and removing him from office, or a military officer to disobey direct orders.
Are you under the impression the president can actually do it? It's not true, someone else at least needs to at least push another button. I'm 100% sure of what I said in regards to the USA, just not hidden nuke programs I wouldn't know about. No person in the USA can single handedly trigger a nuclear weapon launch. What he has authority to do is ask someone else to launch a nuke, and that person will then need to decide to do it.
Even the president needs someone else to push a button (and in those rooms there's also more than one person). There's literally no human that can do it alone without convincing at least 1 or 2 other people, depending on who it is.
Even the president needs someone else to push a button (and in those rooms there's also more than one person). There's literally no human that can do it alone without convincing at least 1 or 2 other people, depending on who it is.