WASHINGTON-In 1836, slaveholders took Dred Scott, an enslaved person, from Missouri, a slave state, to the territory that became Minnesota. The law governing that territory prohibited slavery.
Article II, Section 1: Function and Selection, Clause 8: Presidential Oath of Office;
Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:– 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.
Aaaand there it is…
Article II, Section 1: Function and Selection, Clause 8: Presidential Oath of Office;