I think you're falling into the "they are playing 5D chess" trap, whereas the truth is almost certainly much simpler: two powerful men with giant and brittle egos, who were on a collision course from day one, have now collided. That's it.
They’re to powerful men with huge egos who fundamentally disagree on political priorities. Trump had a platform: https://www.donaldjtrump.com/platform. Balancing the budget wasn’t on it, but the following was: “FIGHT FOR AND PROTECT SOCIAL SECURITY AND MEDICARE WITH NO CUTS, INCLUDING NO CHANGES TO THE RETIREMENT AGE” (all-caps original).
