High-profile tech billionaires, including Jeff Bezos, Mark Zuckerberg and Elon Musk will sit front and center at President-elect Donald Trump's inauguration.

The Constitution spells out the precise wording of the oath required of presidents: “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.”