What are the primary responsibilities of the President?

The primary and most fundamental responsibilities of the
President is to serve as Commander and Chief of armed forces.  The military is under the
civilian control, which means that the President is able to command and give orders to
the military for any operation seen as vital to protection of national interests.  The
Commander in Chief capacity of the armed forces is a vital responsibility to the
President.  Another critical function of the Executive Branch and the President is to
ensure that there is a working relationship between the proposal of laws and their
passage in the Legislative Branch.  In this light, the President is seen as a force that
must work in conjunction with the Legislative Branch.  Disagreements can be there, and
are even encouraged under the checks and balances principle of the Constitution. 
However, the configuration of the branches of government ensures that the President is
able to find some level of negotiation and common ground with the legislative branch in
the passage and approval of laws.  In this, the signing and enforcement of these laws
becomes one of the most important responsibilities of the Executive
Branch.