The people need to accept him as their president because he will be president. Trump doesn’t have to do anything. It’s all up to those stupid people to deal with reality.
Yes, he does.
"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."
Sound familiar?