Answer:
The President is using the power of diplomacy and negotiation to end the war. By contacting the leader of the country the U.S. is fighting and expressing a desire to discuss peace, the President is utilizing diplomatic channels to seek a resolution to the conflict.
The line from the scenario that supports this opinion is: "He contracts the leader of the country the U.S. is fighting and says he wants to discuss peace." This indicates that the President is engaging in diplomatic communication with the opposing leader, expressing a willingness to negotiate for peace.