So Trump is increasing spending already. One might also comment this is hardly surprising since he did the same in his previous term, when he overspent by 4.6 trillion (meaning he enacted policies that would cost the US that amount over 10 years), and that was because congress stopped him from doing more damage. Trump is responsible for 20-25% of the entire US public debt in 2025 (Biden at most 5%, and a lot of that was Trump policy, mainly the tax "reduction")

Does this benefit Musk? Well, the pentagon announced they're paying about 6 billion to SpaceX, so in one announcement about 3% of their Trump-announced budget increase is going to Musk. They're also buying from Tesla, against just about everyone's advice, but are unwilling to say how much. They're also paying a lot for Starlink and even Xai, but also not known how much.