What is the highest legal authority in the United States government?

a. the PresidentB) U. S. ConstitutionC) the Supreme CourtD) state constitutions

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.