Moot point as someone like Trump ignores existing tools and just makes his own.
Also, Trump could have been stopped by the processes in place in USA, they just were not properly used. There were several cases open against him, they just failed to do what they were supposed to.
That's not the problem. The US now effectively has a system where you don't prosecute presidents for any crime. You should note that the ongoing criminal investigations against Trump were mostly cancelled when it became obvious that he'll be the next president.
If this system had been in place when Nixon did his crimes, he would've just shrugged and kept going.
You are indeed not Europe now, not even close. Well, except for Hungary and Belarus.
Also, Trump could have been stopped by the processes in place in USA, they just were not properly used. There were several cases open against him, they just failed to do what they were supposed to.