If Republicans would be oh-so concerned about the US "going broke" they wouldn't be pushing through trillions in tax cuts.

And much of this meeting with Zelensky had nothing to do with the budget (or at least the bits I've seen). It's just Trump being upset Zelensky isn't bending over backwards to praise Trump and being obsessed with shown to look "better" than other presidents (which is why he goes off on a tangent about Biden and Obama, disconnected from what Zelensky actually said).