President Gerald Ford removed assassination of world leaders as an option in an Executive Order approximately a quarter century ago. I'm not sure when he signed the Order but it was obviously during his Presidential term (1974-1977). To my knowledge this has yet to be altered. Mainly this order would pertain to the CIA because it would be the CIA's job to carry out such an order [generally], however, this order pertains to all government agencies as far as I have ever had knowledge of. The main goal was to remove assassination as a means of policy change in a foreign country [by replacing a leader]. Of course this would not be the case during a war... In the U.S. the President cannot alone declare war [even though he might wish to]. Assassination would be something only the President and the relevant agencies would be involved in. Surely Congress would never be informed. This is too much power to hand to a President, IMO. The Executive Order was a good one however it was too broad because, yes, there are times, like now, when assassination would be the best resolution to a situation saving immeasurable bloodshed.