I see nothing in here about prosecuting other countries for war crimes committed in the other side of the globe……
As the chief officer of the Department of Justice, the attorney general enforces federal laws, provides legal counsel in federal cases, interprets the laws that govern executive departments, heads federal jails and penal institutions, and examines alleged violations of federal laws. In addition, the attorney general may be called upon to represent the United States in the Supreme Court in cases of exceptional importance. The attorney general serves in the Cabinet of the president of the United States.
The attorney general is in charge of supervising United States attorneys and marshals in their respective judicial districts. While attorneys are responsible for prosecuting offenses against the United States and prosecuting or defending in proceedings in which the United States requires representation, marshals issue orders and processes under the authority of the United States.