Now, for the record, we do not actually have an executive-centered presidential system, or even a presidential system. At least, if we do, that’s not the Constitution’s fault. Congress is Article I, and for a reason: Congress is a hugely powerful legislative institution. It can act in almost all areas of governance, overruling the president — given sufficient unity. Indeed, Congress can get rid of the president — again, given sufficient unity.I have plenty more to say about all of this, but I think I'm going to stop right there, other than referring you to the rest of the post, because this is really, really, important. The US system is one of separated institutions sharing powers. It is not a "presidential" system.