Our elected officials don't have any direct power over government agencies (ministerstyre), they create laws that the agencies need to follow. Then we have independent bodies that can investigate and remove bureaucrats that don't follow the law.
Now are there any cracks in this system? Probably. But we dont have a president with unlimited power than can only be checked by congress at this point.
Eh, they've already seen that with the balkans and eastern bloc countries in the 80-90s. You're gonna get a bunch of Orbàn-like small time dictators on every state that once on a while have to bow to the requests of a central-government more interested in its own political intrigues than governing anything.
US Doomers are expecting something similar to the Civil War movie in the next few years, the reality will be more similar to "The Lives Of Others".