It is the President, because he exercises the country's most important jobs. -Mobilising the Armed Forces -Creating Diplomatic Relations -Breaking Diplomatic Relations -Gives orders to deploy bases -Decides which laws will pass -And many more
The Constitution is not a legal authority. It is more like a law to be followed
I think it's US constitution. it can not be debated, and is paramount. where as everyone else has checks and balances in place to prevent them from being too powerful.
