Over his 1.5 presidential terms, Trump has accumulated over a quarter of the US debt ($11T / $40T):
* https://www.us-debt-clock.com/presidents
Some mitigating circumstances are COVID in his first term (also effecting Biden), but there's also a lot of 'self-inflicted' damage, especially the last two years.
It turns out tax cuts may not actually pay for themselves (never mind ill-considered military adventures).