Question

What is the oath that the president must say?

Answer 1

The President Oath of Office is:
"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."

Answer 2

Every president starting with George Washington has said the same oath at his inauguration:

"I do solemnly swear that I will faithfully execute the office of president of the United States, and will, to the best of my ability, preserve, protect, and defend the Constitution of the United States." The president customarily adds "So help me God."