While Mr Carter does not name President Obama, there is little disguising that he is the principle target of his stinging words. Recent weeks have seen a slew of media reports detailing how Mr Obama has grown increasingly dependent on drones to take out suspected terror cells and describing how he has the final word to approve names on a "hit-list" of most-wanted terror suspects overseas for assassination. "Revelations that top officials are targeting people to be assassinated, including American citizens, are only the most recent, disturbing proof of how far our nation's violation of human rights has extended," Mr Carter wrote, concluding that the US is "abandoning its role as the global champion of human rights".