The television series Trackdown really did produce an episode featuring a “Trump” character who came to town claiming that only he could prevent the end of the world by building a wall (and also sold special force propelling umbrellas to deflect meteorites). The episode (S1, E30) aired on CBS in 1958 and was titled “The End of the World.”
Walter Trump, a confidence man, puts on a long robe and holds a tent meeting in the town of Talpa. He tells the townspeople that a cosmic explosion will rain fire on the town and that he is the only one that can save them from death. Ranger Hoby Gilman attempts to prove Trump is a fraud.
Narrator: The people were ready to believe. Like sheep they ran to the slaughterhouse. And waiting for them was the high priest of fraud.
Trump: I am the only one. Trust me. I can build a wall around your homes that nothing can penetrate.
Townperson: What do we do? How can we save ourselves?
Trump: You ask how do you build that wall. You ask, and I’m here to tell you.