Descriptions of the requirements and powers of the president may be found in
article 1 of the u. s. constitution
article il of the us constitution
article ill of the u. s. constitution
article iv of the us. constitution

The answer would be Article II of The Constitution. Article II established the Executive branch of the United States government, which is headed by the elected President Of The United States, and herein displays their powers, responsibilities, and limits.

A. flexibility in religious services