Breaking up is hard to do — especially when one party is a billionaire with near-unassailable dominance of the nation’s ability to launch things into space, and the other is a president who has staked a significant portion of his legacy on wildly ambitious space-based projects.

Elon Musk and Donald Trumps once-close alliance has broken down in full public view. The Tesla CEO has proposed creating a new political party—“The America Party”—to represent what he calls the “80% in the middle.

As Elon Musk and Donald Trump take jabs at each other online, their respective businesses are plummeting in value.