Tax Cut and unabated spending...THEN...COVID hit, necessitating stimulus spending, which he botched by cutting out the Inspector General who was supposed to oversee all the spending...why would a fiscally responsible President do such a thing? (Hint: Trump isn't fiscally responsible..., plus he's a constant Fraud). In short, DJT has, and will continue, raiding the U.S. coffers for himself and wealthy friends...just like his BFF, Vlad does in Russia.
As for Biden, he takes his job seriously, and made sure there was an IG for his COVID spending, and then introduced legislation as well as budgets, that actually reduced the deficit and would continue to stabilize it. (see attached link).
Trump will never, ever, change...he is by nature a Felon, Rapist and Fraud...along with being an incredibly weak man being controlled by the nation's worst enemy, Vladimir Putin. Now just sit back and watch what happens...both domestically and internationally...he won't ever try to work for ALL Americans like Biden, or Harris, and seek common ground legislation for problems like Immigration and Energy Independence (which we can't get with FFs alone).
Link: https://www.whitehouse.gov/briefing-room/statements-releases/2024/03/11/fact-sheet-the-presidents-budget-cuts-the-deficit-by-3-trillion-over-10-years/