President Trump’s declaration on Sunday that a “lot of people want” him to run for a third term and that “there are methods which you could do it” appears crosswise with the 22nd Amendment to the Constitution. Mr. Trump added that he is “focused on the current” but that he “likes working” and is “not joking” about serving a third term. He seems to be thinking that he could run for vice president, then have the 48th president quit.