Three ways it could happen (h/t Cilizza):
1. Trump runs as VP in 2028 with JD Vance as the presidential nominee. There is either an implicit or explicit understanding that if Vance is elected, Trump will be the de facto president again. Asked by Welker about just such a possibility, Trump responded “that’s one” before adding: “There are others too. There are others.”
2. Trump stays in office and the Supreme Court capitulates. He could simply say the 22nd Amendment doesn’t apply to him for some reason — and if a majority of the nine Supreme Court justices agree then, voila, he stays.
3. Trump stays in office, the Supreme Court rules against him and he ignores it. Under this scenario, Trump basically says I have the military with me and I am staying.