Or, easier method. He runs. Democrats sue saying he clearly can't have a third term. SCOTUS declines to take the case because the constitution says he can run, he just can't be elected.
States wait for each other to take him off the ballot, since elections are state run and eventually none of them do because they waited too long and they are super-duper sure he won't win this time.
He wins, Sued again, SCOTUS declines to take the case because he's a sitting president and who are they to mingle in elections "we can't set a precedent of stealing elections from the people's choice" or something of that nature.
Opposition falls in line because, yet again, the majority of Americans decided he and the GOP were the best choice and they'll lose if they fight back. But really, if he wins a third term, GOP owns Congress and there's not a damn thing you can do about it anyway.
Boom, third term for Trump

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