The President's direct staff, as well as institutions like the Office of Management and Budget as well as the Department of the American Chamber Of Commerce and trade, make up the Executive Office of president, or EOP. A American president of America will be in charge of the executive branch.
To come to peace you would have to change the mind of almost every powerful person in the countries at war. It would be easier to end the war because it is easier to use force than to use opinion.