Article II, Section 1, Clause 8:
“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.”
In my adult life, I can name TWO that actually took this to heart and did it. President Reagan and President Trump.
FReepers that are older than me can add to this august body of Presidents as they see fit, of course. ;)
And the Dems (plus stealth Dems) swindled Reagan by failing to perform what they promised to do in exchange for amnesty.