The treaties and the agreements are part of foreign policy. As the chief administrator and chief executive of the national government, the president makes sure that the government runs smoothly. The president is the boss of millions of federal employees from postal workers to FBI agents. Presidents also pick or appoint ambassadors, cabinet members and Supreme Court justices. Ambassadors represent the United States in other countries.
Cabinet members are the leaders of different government departments.
Supreme Court justices are the leaders of the judicial branch. The Senate must approve all the president's appointments. The armed forces of the United States also answer to the president. However, the president cannot declare war. The president cannot make new laws, but has the authority to pass or veto bills, plans and programs that Congress, the legislative branch, presents.