“If they do, who’s to overrule them?”
They’d be impeached in about 5 minutes. You can’t declare something in the constitution invalid unless another amendment is passed which over rules the first one.
They’re going to get around the 22nd Amendment. And they’re not going to get 2/3rds of the states’ approval to do it.
Like I said, use your imagination as to how. They have no intention of going anywhere after eight years. None whatsoever.