From the Guardian
Still, the most likely scenario for a torture prosecution is something like what happened to ex-Chilean dictator Augusto Pinochet. His own country wouldn’t touch him, but an industrious Spanish prosecutor – aided by the work of human rights activists and backed by international opinion – indicted him for torture and war crimes and nearly snared him. If Bush, Cheney or Rumsfeld faced a similar indictment from abroad, Americans would be outraged – but not really. The US government would try to head it off, but wouldn’t be able to do much. No one would actually go on trial, but the indictees would see their travel options humiliatingly curtailed and go to their graves knowing the phrase “charged with war crimes” will be next to their names in the history books.
