The primary source of law the supreme court would interpret to determine if the executive order was enforceable would be the constitution.
A constitution is a collection of guiding ideas or accepted precedents that serve as the foundation for a polity, organisation, or other sort of body's legal system and frequently specify how that institution is to be governed.
A written constitution is said to be one that contains these principles in a single legal document or group of legal papers; a codified constitution is one that contains all of these principles in a single comprehensive document. A significant example of an uncodified constitution is the United Kingdom's constitution, which is instead contained in various basic Acts of a legislature, legal decisions, or treaties.
Learn more about constitution here:
brainly.com/question/19411179
#SPJ4