Three nerdy high-school students time travel back to 1940s Queens in attempt to stop future President of the United States Donald Trump from being born.

You should give your story an unexpected twist:

"After they travel back in time and stop Trump from being born, three nerdy highschool students must set things aright when the new future turns out to be a dystopian nightmare."

I take it your taking a Back to the Future approach to time travel, rather than an Endgame approach?

Why Donald Trump? Why not Hitler?

I also think that the real story is potentially what happens after they achieve this. The stopping of his birth is merely the inciting incident. This is obviously very dependant on the story you're trying to tell and why.