Classically, Congress held the power of the purse, able to both bar and require spending. This imposed a significant limit on Presidential power. With a bought court supporting him, Trump would have significant ability to essentially chart power as a king.
Read about the simulation games this researcher conducted with groups who score high on his authoritarian-type personality scale versus those who don’t: https://theauthoritarians.org
TLDR: When the world is run by right-wing authoritarians, it ends in famine and nuclear war.
Thank you. I downloaded the book!
Also: the last update on the site. R.i.p.