If a president believes that emergency conditions require a quick decision regarding an agreement with another country, which tool allows him to make a decision without Senate approval?

The Executive Order and Executive Power allows a president to make decisions without the approval of the Senate. These are orders passed down by the president that are directed to certain agencies or branches within the government. When the President orders something to be performed, other departments of government must agree with it so long as the orders are within the law and the constitution.