US government officials have been caught lying countless times when it comes to "national security" issues. What gives this particular promise any credibility?

US government officials have been caught lying countless times when it comes to "national security" issues. What gives this particular promise any credibility? Is this "promise" legally binding? What about the next Attorney General? Or the next one? Even if he isn't executed, he could be physically and psychologically tortured. I'm not sure if you know much about the US prison system, but this is a common and officially sanctioned practice. Many people would consider a lifetime of torture to be a worse punishment than execution.